Beginning as smaller tribes among primitive tribal world in earliest age of the Second world of Remnant, in order to find better way for combating their Aura-empowered warlike opponents who raid their settlement continently,
Footnote: Although Aura power could be used by anyone 'with a soul' in theory, activating and further developing such power could quite be almost difficult for even ordinary people to withstand without putting in and undergoing such extraordinary amount of degree in terms of both effort and similar-to-near-death experience and lastly, which is most essentially, involving such same above-mentioned amount of degree of inborn prerequisites, including both chances and natural talent, especially for those who are unaffordable for involving extreme intensive combat situation, for example ordinary commoners have more difficult time and fewer chance on activating and developing their own Aura power compare to combat-trained and combat-experienced warriors who are combat-talented, which mean that it's quite problematic for smaller tribes who have not enough populational amount to provide considerable supply of warriors to defend from Aura-empowered raiding opponents. And even the one using Aura-activation drug/herb/potion, not only need to be made of considerable high-qualitied ingredients and conducted relative-highly-complexed ritual, but also depend on subsequently additional extensive training to keep Aura's quality improved and consistent, otherwise Aura-activation and its quality of consistency isn't 100% guaranteed, including having weaker protective force field and power fade away after relatively short time.)Several important figures from their own tribes, including tribal leaders, elders and religious figures, including shamans, had reached their common consensus after certain inter-tribal gathering event, which meant "granting tribal members the ability to transform into some forms which looked like Creatures-of-Grimm in order to have better chance to fend off Aura-empowered raider who invaded their living place and took whatever their had" in short.
In order to carry out their "superpower-granting" plan, besides preparing associated ingredients of Grimm-form shifting potion and further refining potion formulation, they not only contacted with many smaller tribes, who not only from eastern-Sanus, but also some from far-away Anima as well, and also held certain massive gathering event for inviting participated tribal representees (usually as either tribal leaders, elders, shamans or well-known warrior) in order to practice "superpower-granting" ritual: providing them the certain potion through drinking in order to "grant their own form of Grimm they transformed" (along with other "precautional measures" in case of "incident prevention". After went through this ritual and turn back to their own tribes, they started to build and spread out their own influence range for the aim of making their own tribes more safer, despite facing other adversaries including [Spirit-folk] and [Silver-eyes groups]. Among all of Grimm-folk tribes, the [Oni demon] tribe had most significant range of expansion in terms of influence, and even to certain level launch the large-scale widespread aggressive raiding wave against numerical amounts of settlements, especially in eastern-Sanus, and caused serious damage on those settlements which is historically called as "Dark-tides", not just these settlements like [Spirit-folk] and [Silver-eyes groups] on eastern-Sanus were affected, but also other non-[Oni demon] tribes as well, as the raiders of [Oni demon] tribes would view anyone who was not [Oni demon] tribe as the target of raiding. Nevertheless, there were some [Oni demon] tribal individuals who chose a more diplomatic method which demanded non-Grimm-folk settlements give a few of their female villagers as marriage mates for their tribes to increase their tribal population as the exchange for either the discontinuation of raiding said settlements and leaving these settlements alone or settling a 'protection agreement' with said settlements and ensure to keep these said settlements the certain distance for their tribes and no longer disturbance and harassment on those said settlements, instead of just raiding these settlements. And the massive infighting among multiple factions within the [Oni demon] tribe finally brought an end to this series of raiding events.
Footnote: despite the persuasion from certain faction led by so-called {dark woman} for demanding the Grimm-folk tribes to "join her side", the Grimm-folk tribes' strong and fierce attitude on their own independence and autonomy had made their having a strong desire against under so-called {dark woman} and her associated faction's rule, combining with the "external unknown reason", eventually so-called {dark woman} and her associated faction gave up on the idea of putting the Grimm-folk tribes under their rule.)Following much more widespread phenomenon on the application of Aura utilization and rising amount of Huntsman-like fighters (along with long-term holdout of certain groups like [Silver-eyes groups] and 'other factors'), overall population number of all Grimm-folk tribes have been generally largely decreased than before, especially for [Oni demon] tribe having more significant populational declining due to both external force event (e.g. fighting against groups like [Silver-eyes groups] during the "Dark-tides"] and internal conflict (e.g. civil war between their own tribes)). Even though there were several reported appearances of Grimm-folk's involvement during the Great War, such accounts were rare enough to considered as baseless rumors. Current, most of their population are mainly living in much more hidden and remote places like mountains, islands and underground caves, where are usually far away the Remnant's civilization area such as [the Kingdom of Vale].
When changing into Grimm-form, their sclerae will change from white into black (from iris peripheral spread to sclerae peripheral) at first while their iris will glow at a certain level (which is usually used for showing the aggressive emotion like being raged, intimidating the opponent or served as warning sign of either "ready for any violent action" or "preparing for the battle/fight"), and then the black linear strips, which are unique according to their own Grimm-type, will grow on their own body, covering and spreading from face to the end of the limbs, then their own series of specific Grimm-like matter will be produced from black linear strips on the external layer part of their body (or between epidermis and dermis), and finally transform into their own specific Grimm-form along with usage of their own Grimm-form's associated abilities, such as transforming into certain-giant-Grimm-monster-like form and producing Grimm-like matter which provide additional functionality (they are usually not able to change into Grimm-form until they are around ten years old, despite still having some exceptions, and they consider this event as a rite of passage).
When in Grimm-form, even in initial stage of Grimm-form transformation (in short, still staying in human-look appearance while without utilizing any Grimm-form's associated abilities), this form can negate Grimm's sense and mask their "human/soul presence", making them seem "invisible" and "undetectable" to the Grimm which able to reduce the Grimm's attraction and even further decrease the Grimm's aggression and hostility tension toward the tribal members. If any parts (like cut-off remaining parts)of Grimm-like matters which the Grimm-folk produced are remained, these parts will be self-evaporated after a while, and Grimm-form in both (initial and terminal) stage will not be faded away/reverted back to human form until through either voluntarily mean, being incredibly fatigued or being knock out unconsciously. And furthermore, overusing said ability under abnormal circumstances including under serious fatigue could lead to great amount of muscle mass amount reduction and in more severe case would cause potentially fatal consequence.
In terms of Grimm-form transformation, it could be cataloged into [partial form] and [completed form]. Partial form is usually applied on between the initial stage and terminal stage in Grimm-form transformation and only have access of half the amount of Grimm-form abilities, for example only one giant arm part is grown out from [Giant wolf]'user's single arm or only one additional arm part is grown out from [Six-arms demon]'user's body. Meanwhile, completed form is usually applied on terminal stage in Grimm-form transformation and have full access of whole amount of Grimm-form abilities, for example [Giant wolf]'user is able to transform into giant-wolf Grimm-form completely or all of four additional arm parts are grown out from [Six-arms demon]'user's body. Comparing to the latter one, partial form has lesser amount of usage risk, more energy-efficient, more operationally refined and more utilitarian, despite having only half an amount of strength and power of completed form, and also relatively harder to achieve especially in the first attempt. {fun fact: both of forms are allow said user to communicate vocally with other human}``{As giant-Grimm-monster-like forms including [Giant wolf], [Tall treeman] and [Giant crow], are technically separated forms which are fully made of Grimm-like matter that said users are intacted inside these form, there are no digestion system in these forms and no connect with said users' one, in short giant-Grimm-monster-like forms are "Mud puppet which inside without any internal organs except the said users are intacted inside within these forms" in terms of anatomical structure. Therefore if a certain object like a piece of log is clamped by the jaws part of these giant-Grimm-monster-like forms, instead of being vored, a certain object will more likely either be clamped tightly by the jaws part or in more brutal way, be bitten in halves} {fun fact: as said users are human in core natural, their reaction are similar (or more specifically, basically no different to} everyone living in world of remnant when eating creatures of Grimm' parts and dust, such as feeling like eating 'tasteless/most bitterest over-burnt bunch of ash' when eating creatures of Grimm' parts(or their Grimm-like-matter-formed part they produce) (which are so disgusted that general Grimm-folks have higher preference on eating normal human food (e.g. juicy meats, fresh seafoods and vegetables, tasty fruits),over their Grimm-like-matter-formed part they produce, except for extremely few "too-dumb-to-live" type individuals) or feeling like 'huge fire inside the mouth' when chewing a bit of fire dust}
In terms of regenerative healing ability, although all types of Grimm-folk have the access to regenerative healing ability, such as regrowing lost Grimm-like-matter-made part and recovering the wounds when in Grimm form, in terms of certain theoretical aspect, not all types of Grimm-folk have the strong regenerative healing ability at the same level and could be varied greatly between each types of Grimm-folk, and for ones who have low-level regenerative healing ability are either heal the wound slowly or still need additional care (including pain tolerance medicines for some individuals) in order to accelerate the healing process. Moreover, there still have limitation on their regenerative healing ability, such as cannot regrow (and reattach as well) said user's original human part like teared-off limbs (and of course head from decapitation) etc. When in partial form of Grimm-form transformation, said Grimm-folk have at least half of amount of regenerative healing ability that are good enough to heal up the decent amount of wounds, and then when in completed form of Grimm-form transformation, said Grimm-folk have complete access to full-on regenerative healing ability. In terms of each types of Grimm-folk's quality level on regenerative healing ability, there is the comparison list ranging from ones who located at the front as lowest to ones who located at the end as highest:
Despite having similar appearance compare to the true Grimm such as [Giant wolf] tribe to Beowolf, there are some differences between them, for example the color of Grimm-form's main body (Giant-Grimm-monster forms especially) which the Grimm-folk constructed is mainly purple rather than pure black, harden armored parts (like bone armors) are blackish purple instead of white, eyes-color are accorded to said user's own eye ones instead of just red or yellow.
Due to utilization of Grimm-like matter which typically block (sometimes descripted as "being absorbed limitedly") and even cut their access to use Aura, they can't use Aura at the same time when they are in Grimm-form, though the utilization of the Grimm-like matter (and further, Grimm-form) the Grimm-folk tribes used itself don't neither affect nor cause drainage and depletion of Aura energy of Grimm-folk tribe members, as both of the Grimm-like matter the Grimm-folk tribes utilized and Aura are separated power systems. In terms of comparison between the Grimm-like matter which the Grimm-folk tribes utilized and Aura, despite lacking protective energy barrier the Aura provided, the Grimm-like matter can be used almost instantly without the need of preparation for being activated at first, have much better regenerative healing performance than Aura, don't have the concern on being depleted when using the Grimm-like matter, which the Aura do, and lastly don't have the risk of leaving themselves to be vulnerable or undefended while recovering the energy barrier (in a certain timeframe) after being broken which the Aura needed. Nevertheless, there are some conditional situations that Grimm-folk could have access to using Aura power (*being viewed as being theoretical by most of the Grimm-folk): either using Aura power while not in Grimm-form or [in more recent case] summoning Auric-spirit from themselves with the cost of cutting off access to Grimm-form transformation ability. In terms of practice of Aura usage, said practices are generally unutilized among Grimm-folk tribes in eastern-Sanus, still said practices in certain forms are applied by some Grimm-folk tribal members in Anima "for additional health benefits".
In terms of reproduction, when both of two parents are same type of Grimm-folk (such as both of two parents are [Oni demon] tribal members), the children of such unions typically always have same Grimm-form type which is passed from their parents. When each of two parents are different types of Grimm-folk (such as one of two parents is [Oni demon] tribal member while the other one is [Giant wolf] tribal member), the children of such unions are typically always inherited with one of two Grimm-form types from their parents (for example the children of [Oni demon] parent and [Giant wolf] parent will be received either [Oni demon] Grimm-form or [Giant wolf] Grimm-form) (except for the case of [Perfume succubus]: whether the union's counterpart is Grimm-folk, human or Faunus, the children of such union are always be [Perfume succubus] (along with inherited birthed ratio trait of having about 85 to 90 percentage chance to be birthed as female)), and also do not appear as hybrid infants having mixed traits of both Grimm-form types. In terms of the union with either human or Faunus, despite being genetically comparable between both sides, the children of such union are always Grimm-folk (of any type) at all, neither having other birthed human or Faunus siblings along with the Grimm-folk infants, nor appearing as hybrid infants having human or Faunus' traits mixed in (,which in short do not have any additional animal traits such as having an additional pair of cat ears). Lastly, in terms of the union with [Silver-eyes groups], their birthed descendants are typically always either very short-lived or have severe genetic defective illnesses, which typically result in death after birth in a very short time in both cases.
[Society and Culture aspects]
Among the tribal world of the Grimm-folks, there are several overall differences between western (eastern-Sanus) tribes and eastern (Anima) tribes.
Most of Grimm-folks live in large-scale tribal society under the hunting-gathering lifestyle, usually in form of campsite involving several of either come-shaped or hemisphere-shaped tent for each of families in forest's certain empty space. They not only live with their parent, their own children and their closest siblings, but also their extensive familial members like their uncle, aunt and cousins as well, while their grandparents typical have their own role as dealer with intertribal communication and relationship matters while being the member within their own tribe. Male and female roles in such tribe have been seen as complementary and indispensable, with no distinction of rank between them, they not only responsible for teaching their younglings about survival skills like hunting skill and martial skill, crafting skills like toolmaking, but also medical skills like using medical herbs to tend the wounds and cultural skills like oral history about their own origins. The adults also make face-masks made of various materials like woods and clay that resemble the Grimm-folk's face in partial Grimm-form to their younglings and will sometimes gather all younglings of their own tribe in certain empty place in forest to show their own Grimm-form in partial form to these younglings at the certain safe distances before the "rite of passage"(in order to ensure their own younglings not be scared to death after both adults and younglings seeing either their own parents and their own children (or other Grimm-folks) transform into the Grimm-form). Originally, they tend to prefer marry with same type of Grimm-folk tribal member, mixed marriage (which in namely the union between two different type of Grimm-folk tribal members) are more common in their current generations, though these children of such unions are typically more treated as closer to their extensive familial members.
(special case: "lost younglings", this term are usually referred to the Grimm-folk young orphan either lives alone away from their originated destroyed tribal settlement, be adopted by outside world's family members (when said orphan be as young as the birthed baby) without premise-knowing about said orphan's true identity,
(or in more recent and rarer case, be orphaned in eastern-Sanus away from Eastern (Anima) tribes they originally birthed since from their young age around 20 to 15 years ago due to "be teleported from Anima to eastern-Sanus )during certain random hidden teleportation phenomenon", that said type of orphans are quite easy to confirmed by Western (eastern-Sanus) tribal members when they witness certain either [Perfume succubus], [Six-arms demon] or [Blackmud demon] individual appearing in eastern-Sanus). These type of young individuals, especially those who lived with outside world's family members, usually have their own mindset more closer to outside world's (e.g. the Kingdom of Vale) than Grimm-folks' one due to their lost connection to their own Grimm-folks' cultures and relevent knowledge. And in terms of final fate for those tribal orphan, especially after they go through rite of passage "aka able to change into Grimm-form", they will either being killed as mere Grimm (by either silver-eyes user groups or outside worlders), being abandoned again with no any records and tracts left, or (even for Grimm-folks themselves consider this as ultimate-extremely unlikely case) being still take caring and raise to adulthood by outside world's family members who still love said orphan so much regardless of said orphan's own identity while make their own attempting on hiding said orphan's existence from the rest of the outside world (especially huntsmen and huntress). When western (eastern-Sanus) Grimm-folk tribal members find those "lost younglings", not only they talk about everything on Grimm-folks' cultures and relevant knowledge to those orphans as possible as they can, but also will make their own attempting on let said orphans joining into their own tribes [, or in case of those orphans from Eastern (Anima) tribes, they will make their own best attempting to connect with Eastern (Anima) tribes they originally birthed and will make their own attempting on let said orphans reunite and then join into Eastern (Anima) tribes they originally birthed], regardless of being success or nor.)
In terms of food and material sources, they mainly collect these food throughout hunting, fishing and foraging, along utilizing smoking and air-drying for preserving food, though some tribes(like mixed tribes that includes [Darkvine plantman] and [Tree swinging fabric-strip demon] living in a certain middle-size island where is located in nearby most southern coastline under eastern-Sanus) combine these above-mentioned food collecting methods with small-scale farming which mainly grow certain types of root vegetables and melons. Moreover, they mainly eat meat from local wildlife like rabbit, salmon, peasants, deer, wild boar and cattle(most priced meat which only have chance to eat in feast after certain competition event, though some could be come from certain lost livestock from these poor Vale farmers!) along with berries and other edible wild plants they forage. In terms of toolmaking materials, they commonly use stones, animal hides and pelts, tree branches, bones and horns for toolmaking purpose, blacksmithing is quite rare among these tribes(even though there are some appearance of metal-made weapons such as sword and old-timed firearm like single-shot hunting rifle, which are usually reserved for certain individuals like well-experienced hunters, veteran warriors and even some of tribal chiefs, in their arsenal, those weapons are usually come from scavenging source, which some of them could be track back to Great War period or more earlier ones), even they use few to some amount of dust in toolmaking, the Dust form they used are usually in form of unrefined crystals, their usage on Dust are at most for crafting alternative spearheads and arrowheads or sometimes as some kinds of "special ammo" for the slings, like fire dust crystal ammo for the slings, which will release elemental effects like flaming and burning once said ammo be cracked on force. During the military actions such as raid and tribal campsite defense, besides utilizing their own Grimm-form's abilities, they will use long-range weaponry including short-bow and arrows, throwing-spears, throwing-axes, slings along with some long-range firearms like single-shot hunting rifles for long-distance combat at first, then will use various weapons like spears, axes along with some middle-to-short-range firearms like single-shot pistol and old-timed revolvers and even rare ones like short-and-wide-barreled Volley shotgun[nicknamed as "demon-breaking-club" by some tribal members, which gain increasing popularity after as following measure of defensing against [Oni demon] tribes' raiders in case of future similar-to-"Dark-tides" event happening again]while up close to opponents, and finally use melee weapons like tomahawk axes, short-clubs and knives for up-closed personal combat (although (small and round) shields were used in Western (eastern-Sanus) tribal' historical early period, said shields became less frequently to be used after further advancements of firearm technologies, and become more as decorations on their tents), also their usual battle strategies are ranged from more common ones like skirmishing, approaching toward the opponents silently before charging the opponents at closer distance, raiding from either multiple sides or at night, flanking actions, ambushing and hit-and-run tactics, to more rare ones like using long-range firearms like single-shot hunting rifles to take enemy leader or other commander-appearance-like figures in case of fighting against more organized military force like Kingdoms' army. In terms of clothing they wear, aside from some appearance differences of each different tribes, their main attires are a long-sleeves shirt and a long trousers regardless the gender who wear, along with few/some adornments including pendants, bracelets and necklaces which are made of natural materials like either woods, stones, bones, horns, feathers and even rare one like metal according to each of their own individual tribes' own customs.
In terms of tribal roles, although there are a lots of male tribal chiefs, female tribal chiefs are considerated as possible and quite common, and both are at least middle-aged adult member within their own tribe. And then those closely with tribal chief are the elders and shamans, the latter, who are charactered by wearing a rope-made headband and a leather-made shawl with colorful patterns, are typically positioned by grandparents from their own tribal family and are mainly responsible for religious and spiritual expertise like holding certain rituals and building and maintaining the tribal altars, along with medical skills like using medical herbs to tend the wounds and cultural skills like oral history about their own origins and while the former are typically positioned by grandparents from both their own tribal family and their extensive familial members are mainly responsible for providing advice on the matters on intertribal communication and relationship. Moreover, roles of warrior, hunter and camp organizer are typically positioned by both early adults and older teenagers, though middle-aged members are also appeared as well, and during military actions such as raiding and tribal defense, the war chief will be elected by tribal elders and sometimes tribal leader as well and positioned by well-experienced (usually middle-aged) warrior or hunter, who are responsible for organizing and leading other tribal warriors within their own tribes (or sometimes cooperating with other outside tribes as well).
In terms of inter-tribal relationship, despite being highly dispersed in the distance between each tribes and rivalry and even attacking other tribes not being out of options, most of the Grimm-folk tribes choose remain peaceful relationship with other tribes, and their tribal conflicts are usually solved with in form of trading, sport and competition, like team sport which throwing ball through loop of opposite side (and more rare, stealing someone(probably some unfortunate Vale farmers)'s livestock (mostly cattle) back to certain gathering place like certain empty space in forest where two different tribes are waiting for them). Even for [Oni demon] tribes who have very deep warrior culture compare to other tribes in eastern-Sanus and the main pusher in "Dark-tides" event also have some sense to make considerable amounts of efforts to recover and maintain peaceful relationships with their neighboring tribes.
In terms of religion aspects, Western (eastern-Sanus) tribal members generally view the world as "the place where mortals coexist with supernature beings including ghost, spirit and undead", and they view the creatures of Grimm as kinds of malicious spirit(both able to be close enough for tribal members(especially when in Grimm form) to be stand nearby the creatures of Grimm without raising the Grimm's any attraction, aggression and hostility toward them, and could be potential dangers and threats when too much campsite-surrounding Grimms are wandering nearby their tribal campsite) {they will sometime send out the warriors to clear out creatures of Grimm in nearby campsite-surrounding area in order to reduce the risk of be suffering further damage and casualties among their tribes, therefore they definitely not worship the god of destruction(and so-called {dark woman} to extension, who said tribes think her of just mere unfortunate and foolish being who just eat toxin Grimm liquid without any cautions)}. In order to "comfort" and "repay" spirits within world for keeping nature's blessing on providing abundant wildlife, their tribal shaman, or sometimes their shaman's apprentices, are responsible for building and maintaining certain altar which the first one is in form of a big flat stone where some of herbs-and-animal-blood-mixing water-filling clay bowl is placed on said flat stone, surrounding within the circle formed of smaller materials such as small stones and small dried flowers, while the another one is made of three logs stacked together and pressed at the top, which a food bowl full of dried food like dried berries and meat jerkies is hanging by ropes under stacked logs for providing few extra boost of edible energy to any wandering tent-packing wanderers (mostly for tribal members). Besides from certain ritual customs, there are many mythological fictional creatures within their oral tribal folklores, such as "giant-ball toad" [small, pink, limbless toad which has bottomless stomach that can vacuum any food it saw, whether said food is from bowl, plate, spinning grill on fireplace and even the altar], "silver imp" [small, silver-color-imp-like-creature who its each of the arms are fused with a single sickle-shaped claws, loving jump on top of trees and leave everything nothing but a single scar], and lastly "silver-wrath" [a vengeful ghost-like being who formed after certain silver-eyes user died alone in wild, have endless rage that will attack anyone within said being's glowing silver-color sight].
{fun fact: even in current days, there are a good number of tribal members, especially those with strong associations with shaman, have strong tribal traditional religion outlook on surrounding world}
In terms of opinions and attitude towards Faunus, they think these animal traits who Faunus the signs of world's approvement on Faunus's own existence have are as the world "see" Faunus being alive in nature rather than being viewed as freaks or the source of discrimination towards Faunus, and said tribes tend to treat Faunus with respects and even ensure to be well-treated, and even further tend to avoid any conflict with Faunus for the longer or even furthermore time(such as during the "Dark-tides", [Oni demon] tribes' raiders had higher tendencies to keep the Faunus alive and even left the Faunus (along with their assets sometimes) alone without any disturbance and harassment compare to human, and when [Oni demon] tribes' raiders encountered certain settlements where have either higher degree of ideological sense on anti-Faunus pure human superiority, these above settlements become more preference for [Oni demon] tribes' raiders to either cause furthermore serious damage on those settlements or more willing to demanded said above settlements forcefully to give their female villagers as marriage mates for their tribes), and even let the Faunus have the right of veto in terms of marriage with the Grimm-folk member if said Faunus wants to their descendants have Faunus traits(e.g. cat ears, goat horns), but this don't mean that they will either give up opinions of defending themselves or let their vigilance down as soon as they aware of said opposite side's malevolent intention, whoever said opposite side is human, Faunus or others else.
{fun fact: there have extremely few, if not very important, thoughts of concerning and worrying among about One millionth of a percent of western (eastern-Sauns) Grimm-folk tribal members' mind that "certain predator-animal-type Faunus will eat certain prey-animal-type Faunus if said both of them are get together too close and said predator-animal-type Faunus is in starving condition", for example when certain Grimm-folk tribal member see certain bull Faunus and certain tiger Faunus gather together, he will concern that tiger Faunus will eat bull Faunus.}{even for western (eastern-Sauns) Grimm-folk tribal members themselves also are aware of and find said idea of above thoughts being highly offensive to Faunus, so they tend to not talk about such idea as best as they could}
In terms of opinions and attitude towards silver-eyes users, they generally tend to view silver-eyes users as quite extremely terrific, fearful and threatful existence beings who said tribal members must to be aware of vigilantly due to brutal historical crashes and conflicts (including several massacres and genocides acts on Western (eastern-Sanus) tribes which committed by certain silver-eyes user groups) between silver-eyes user groups and Western (eastern-Sanus) tribes (,plus there are certain historical rumors that certain radical silver-eyes user groups use far more crueler method on Western (eastern-Sanus) tribal members, like hunting and cooking the Western (eastern-Sanus) tribal younglings as much as like animals). Western (eastern-Sanus) tribes' overall applied measures on silver-eyes user groups are heavily depending on each individual silver-eyes user's own exact nature and circumstance, they tend to either avoid any potential conflicts will keep themselves certain distance with silver-eyes user groups without any disturbance and harassment when in best scenario, following with becoming more protective and give certain silver-eyes users vocal warning beforehand about not harm their tribal members or show said silver-eyes users "the exact consequences they facing" when in good or neutral scenario, or deploying certain urgent and desperate self-defense actions for protecting themselves and their own tribes including preparing for staying in immediate state of combat preparation and "turning their sclerae's color from white into black" when in worst scenario (, except from some [Oni demon] tribal members who consider said silver-eyes users as 'their one and only challengeable foe who will have some nice chatting between them before the battle').
{fun fact: while the "nighttime-wandering order" is effective only in Anima and surrounding areas, They tend to avoid unnecessary conflicts with the (external) known world as much as possible in order to avoid to cause too much unnecessary damages and suffer too much tribal casualties.}
Most of Grimm-folk live in smaller close-knit clan and community groups, and their tribal structure are more centralized than their western counterpart, usually core family group (as tribal leader and their own family, along with their closest relatives in some tribes) surrounding with either sub-tribal family groups or lower-rank family groups. Despite greatly variations on building materials and structures on each of their own tribes, their own residence is usually more suited to permanent residence compared to their western counterpart, and their general settlement arrangement are usually in form of "a main residence(or few main residences) surrounded by medium-sized residences where several smaller residences are nearby". While the childrens of tribe's core family group are usually taught from their parents(along with other specialists like herbalist, tribal priest and veteran warrior), those who below tribe's core family group are usually taught from adults from sub-tribal family groups. And for the education for the childrens of tribe's core family group, besides basic survival skills along with other skills including crafting skills, medical skills and cultural skills which they taught their own childrens at very young age, they emphasis on combining martial art and weapon training with their Grimm-form utilization for balancing their own Grimm-form abilities with their own martial strength, as well as not frightened on their own Grimm-form themselves, in order to focus on both said skills' strength and worthiness, furthermore they also play a varieties of sport, that have strong associations with martial origin, with other fighting-able teens for both warrior training and entertainment purposes, including dual sparring, wrestling, spear throwing, archery, canoeing and boat sailing, though they sometimes play with those who below tribe's core family group like the children from lower-rank family groups as well on these above-mentioned sports, along with other types of sport like various ball games. They have higher preference and tendency to marry with same type of Grimm-folk tribal member than their western counterpart. Besides there are another tribal familial structure called "wandering core-family" by typical eastern (Anima) Grimm-folk tribes, who are typically included few numbers of family members like only their parents (Regarding all types of the said parents combinations in "wandering core-family" , despite all said Grimm-folk parents being Eastern (Anima) Grimm-folk tribal members, the parents combinations of "wandering core-family" are either both of two parents are same type of Grimm-folk which are most common types among the "wandering core-family", each of two parents are different types of Grimm-folk which are the secondary common types among the "wandering core-family", or one of Grimm-folk parent be marrying with other partner from outside world while said other partner without premise-knowing about said their partner of another side's true identity as Grimm-folk which are the least common types among the "wandering core-family") and their own children, usually live away from under either the eastern (Anima) tribes or Mistral's four underworld families structure and often live among other civilian inside the Mistral settlements, along with having high risk of being vulnerable such as being killed as mere Grimm or being attacked by other eastern (Anima) tribes.
Talking about cultural aspect, their cultural variations could be greatly due to living in different geological environments and climates for each of the tribes, and even for the tribes who only have same type of Grimm-folk like [Six-arms demon] also could have individualistic differences on cultural development due to the different geological environments and climates they live in. From wearing fur-trimmed coat and cape in cold mountain region to wearing thicken-cloth-made full-body-cover attires in underground caves to wearing silk-made long-sleeves clothing (either made themselves or traded) in central part of nearby Mistral to wearing plant-fibric weaved clothing in tropical coastline and further far one like the spiky-vine Archipelago(Archipelago full of long and narrow shaped islands, where are located at between most far southwest west side of Anima continent and most far west side of menagerie). Their cultural variations also are appeared in their own food as well, from the snow lamb stew and goat cheese in cold mountain region to farm-grown mushrooms and cave-living giant amphibians in underground caves to waterfowls and bamboo shoots in central part of nearby Mistral to taro, sweet potato and several tropical fruits like pineapple and mango in tropical coastline and other oceanic islands. In additional, asides from considerate amounts of Eastern (Anima) tribes still living in their own traditional tribal way in their own tribal homelands among Anima wilderness and also have some personal connections with certain Grimm-folk tribal members from Four underworld families who live in Mistral capital urban areas (along with these other eastern (Anima) Grimm-folk tribal members living in Mistral's capital as well), for these eastern (Anima) tribal members, including those from "wandering core-family" as well, who living in central part of Mistral, especially for those who living in Kingdom of Mistral's capital, they have been highly integrated with Mistral's civilian's way of life and lifestyle, from material ones like eating dim sum and ramen, learning Mistral's martial arts (such as kung fu and karate), making fine-arts like drawing ink painting and calligraphy, playing games like Mistral chess (aka chinese Weiqi) and tabletop games, celebrating festivals like Mistral's new year (aka eastern-Asian new year)and autumn moon's festival (aka chinese Mid-Autumn Festival), to ideological ones like "protecting people (both human and Faunus) of four kingdoms", "supporting the huntsman and huntress", and "ensure peaceful daily living for people (both human and Faunus) of four kingdoms", for example there are many eastern (Anima) tribal members, including those from "wandering core-family" as well, who live in Kingdom of Mistral's capital, support the current Mistral mayor for the upcoming Mistral mayor election.
In terms of toolmaking (along with weapon making) materials, their own material range are far greater varieties compare to their western counterpart, not just including natural materials such as stones, woods, bamboo, animal bones, animal teeth (especially shark teeth) and even Coral skeletons, but also including other types of materials like metals (either made themselves or traded) which make up a huge percentage of their weaponry and limited but not few amounts of dust crystal, which are usually used in long-range weapon (e.g. bow and arrows, sling and firearms)s' alternate special ammo and even be integrated into explosive weapons (e.g. putting some combustion dust/lava dust/gravity dust crystals inside the primitive-style hand grenades), as well, and also their own, especially in their traditional tribal ones, weaponry not only have a great varieties of weapons' shapes, sizes and lengths, but also lots of their weapon are heavily melee-focused due to their own strong melee-dueling cultural traditions. And about their (traditional tribal) common used weapons, asides from knifes/daggers, spears, staffs and other polearm weapons (of various lengths), their common used weapons are swords (of various shapes, blade form, sizes and lengths, mostly prefer those which are either machete, dao or katana-shaped), war-club (of various shapes, sizes and lengths, mostly prefer shorter ones), maces (of various shapes, sizes and lengths, mostly prefer shorter ones), axes (of various shapes, sizes and lengths, mostly prefer shorter ones), war-hooks (of various shapes, sizes and lengths, mostly prefer shorter ones), war-pickaxes (of various shapes, sizes and lengths, mostly prefer shorter ones), war-sickles (mostly shorter ones), along with some usages of protective gears (mostly equipped by their tribal veteran/elite warrior in some tribes) such as armors (e.g. Lamellar Armor) and shields (mostly small-to-medium-size, some large-size) and some special ones like meteor-hammers, chain whips, claw-shaped weapons (mostly shorter ones), and about long-range weaponry, asides from blowguns, throwing knifes, slings, throwing clubs, throwing spears along with bow and arrows, they also use additional amount of explosive weapons (like primitive-style hand grenades) and portion amount of firearms (both pistol and carbine type guns are popular choices among tribal warriors) which are introduced in later period and many of both are be traded. And in terms of evolutional development of their tribal warfare, despite the exact details are greatly varied on each of their own tribes, there are generally 3 stages of warfare evolutional development on Eastern (Anima) tribes:
[first stage]: at first (around prehistorical period of Mistral), single combat warfare were common practices in Eastern (Anima) tribal warfare, both of combating sides sent their own selected (one or some) veteran/elite warriors from their own tribal warrior group to fight against their opposite side's counterparts in order to break their opposite side's fighting spirit and cause said opposite side's group to retreat, along with occasional raiding on (whether said settlement is Grimm-folks or nor) settlements.
[second stage]: then (around beginning of first Mistral empire), mass heavily coordinated militia force were introduced in Eastern (Anima) tribal warfare. While militia force (polearm users at front while long-range-weapon user at behind) generally are acted both as skirmishing force and as frontline advancing force, veteran/elite warriors will be acted as either shock-trooper, line-breakers or mobile force.
[third stage]: after then (around between ending of first Mistral empire and beginning of second Mistral empire), aside from the introduction of explosive weapons and firearms, military commanding structure in Eastern (Anima) tribal warfare became more tiered, certain veteran/elite warrior who has most combat experienced and talented will be selected from their own tribal warrior group and be appointed and take the role as their own tribal military commander for organizing and overseeing their own tribal military force, following by younger and talented veteran/elite warriors take the role as sub-commander for leading their own smaller groups of their tribal militia force.
In terms of tribal roles, while exact details are heavily depended on each Grimm-folk tribes themselves, there are some key features in their said tribal structure: firstly, most of tribal chief or tribal leader position in eastern (Anima) Grimm-folk tribes are inherited from certain their own core family through paternal lineage (except from matriarchal lineage of [Perfume succubus] tribe), and if said tribal core family haven't any descendants, tribal chief or tribal leader position will be succussed on either their closest collateral relatives or a high-ranking child from other related lineages. Secondly, tribal priests along with other specialists like herbalist, blacksmith and veteran/elite warrior usually come from sub-tribal family groups, and only ways for lower-rank family group members to join above-mentioned ranks are either being considered and appointed by the members of sub-tribal family groups to accept for the lower-rank family group members to join their own ranks or fighting against certain members of sub-tribal family groups in martial dual, or winning against certain members of sub-tribal family groups in (e.g. crafting, dancing, musical instrument playing) competition for non-combat-focused ranks, for deciding whether or not to allow said lower-rank family group members to join sub-tribal family groups' ranks. Lastly, lower-rank family groups such as farmer, fishermen, woodcutters and miners are functionally as "militia" role who are both as main force of their tribal daily production and manufacture during peace time or as "temporally formed military force" for assisting and supporting their own tribal warrior during war time. Besides, despite being patriarchal societies for most of eastern (Anima) Grimm-folk tribes (except from [Perfume succubus] tribe), it is considerable to be accepted for women taking on many man-dominated jobs, such as blacksmith, warrior and merchant.
In terms of inter-tribal relationship, overall relationships between these tribes are usually descripted and considerated as "more strained and less peaceful" by their western counterpart, even for the tribes who only have same type of Grimm-folk don't have complete agreements on everything. Despite inter-tribal peaceful relationships not being out of options plus there are far less amount and less bloodier tribal conflicts compare to past, most of the Grimm-folk tribes tend to more interact with their own who only have same type of Grimm-folk like [Six-arms demon] rather than other tribes like [Perfume succubus] and [Blackmud demon]. Besides, the tribes are much more war-liking tendencies compare to their western counterpart (except for [Oni demon] tribes from their western counterpart) and even for those friendly and nonaggressive tribes who willing to keep peaceful relationships with other tribes also show to tend to more likely willing to fight and put more wiliness on defending themselves from hostiles once their tribal conflict being sparked.
In terms of religion aspects, eastern (Anima) tribal members generally worship on certain their-tribes-associated deities (for examples, these deities the [Six-arms demon] tribes mainly worship to are those whose have their own common unique characteristics of having multiple (at least about thousands) of arms and their face which have exaggerative emotional expressions, and for [Perfume succubus] tribes are mainly those whose are associated with fertility, family, community, caring and bonding, and for [Blackmud demon] tribes are mainly those whose are associated with earth and geology elements like rocks, ores and underground caves), which are basically mixing more folklorically spiritual nature with some of associated divine domains in terms of their deities' inwardness, along with numerous localized spiritual messengers which in form of stone statues of various types of animal like fox, raccoon dog, monkey, dog and cat, as the more interregional assistant role of deities for general Mistral population who mainly responsible for trivial divine duties such as luck blessing, having good weather and improving health condition, and the god of destruction(or so-called {dark woman}, who eastern (Anima) Grimm-folk tribes generally consider {dark woman} as 'incompetent and cowardly being who unable to endure anything and offer anything and just have divine power effortlessly' and even some think of {dark woman} as 'being full of stinky smells and cover with numerous trashes, only stay in deepest sewer as her only forever home' in joking tone) are not one of those deities they tend to worship with. And In terms of mythological fictional creatures within their oral tribal folklores, although each of the Eastern (Anima) tribes have their own mythological fictional creatures within their oral tribal folklores, there are some of mythological fictional creatures which are more widespread among all Eastern (Anima) tribal folklores, such as “dust-crystal-eater”[the small and short rock-like creature which have broad, stubby bodies with short arms, and infamous for endless greedy appetite on dust-crystals], “land-molding giants”[the invisible mountainous beings who able to mold the land into various landscapes like mountains and underground caves like molding clay, and as the embodiment of geological movements like earthquake and continent forming] “weather-furies” [the invisible wind-level speed spiritual beings who have unpredictable personality mixing with always-full-of-madness temper, and are responsible for various climate disasters like heavily thunderous rainstorm and typhoon]. Besides, in terms of their viewpoint towards the creatures of Grimm, their viewpoint towards the creatures of Grimm are quite similar to their western counterpart, aside from view the creatures of Grimm as 'kinds of malicious spirit', they also view the creatures of Grimm as 'chaotic spawns which are leaking, spreading and falling from above the sky from the cracks of underworld realm', and even called 'living-space-occupying-obstacles/pests' by some in joking tone. Aside from sending few their tribal warriors, and sometimes form their temporary militia group, out in order to clean out nearby creatures of Grimm from their tribal settlement, their younger elite warriors sometimes will form their own smaller group to set off from searching and targeting some high-level creatures of Grimm like Beringels, Sphinxs and even Nuckelavee as their hunting targets and killing these creatures of Grimm in hunting-for-sport fashion as their part of rite of passage.
{fun fact: in current days, there are only portions of older tribal members, especially those with strong associations in religion work, have strong tribal traditional religion outlook on surrounding world, while many of younger tribal members have lesser on religion outlook, only they will practice some religion customs when they come to visit their own tribal homelands sometime.}
In terms of opinions and attitude towards Faunus, they think these animal traits who Faunus as the mark of strength and power which allow the Faunus able to have their deserved place on their own, and also in terms of approval on marriage between Grimm-folk and Faunus, not only need said Faunus' approval on whether said Faunus wants to their descendants have Faunus traits or not, but also there need the affirmants from both sides in order to approval on said marriage as well, but there are some negative implications on these attitude such as extreme few of them (especially for [Six-arms demon]) will attempt to provoke Faunus without any reasons at all, and in extreme few cases, they will propose/demand to have forced marriage arrangement with certain Faunus in order to "ending the said Faunus lineage (aka no Faunus traits left)" if they think certain Faunus as 'powerless' or 'weaker' [though said proposal/demand are usually often taken back as long as they see certain Faunus' any signs of 'strength' and 'powerful', such as when certain Faunus apparently stand his ground or don't hold himself back].
In terms of opinions and attitude towards silver-eyes users, who have another name commonly called as "blade-eyes" by eastern (Anima) tribal members, despites having rather limited knowledge on silver-eyes user groups due to Sanus being only original birth place of silver-eyes user groups, their overall reaction towards silver-eyes users are, who are quite similar to their western counterpart and plus the additions of certain silver-eyes users' historical tendency of applying more violent methods on Eastern (Anima) Grimm-folk tribes during their time in Anima, viewing silver-eyes users as quite extremely terrific, fearful and threatful existence beings, albeit mixing additional amount of fearfulness with some amount of respect, with sometime have extremely few (too bold or too dumb) individuals want to against challenge to fight said silver-eyes user directly, (which are usually ended up as either holding themselves back or being hold by other eastern (Anima) tribal members back).
{fun fact: there were another ancient rare-known nickname of called "abyss-people" by people in early Mistral history, which is quite fearful name for those people which implied that the Eastern (Anima) Grimm-folk tribes are actually come from deepest underworld which have associated with certain deities of underworld, soul and death. And in terms of whether eastern (Anima) tribal members think of the name of "abyss-people" being offensive or not, it heavily depends on each eastern (Anima) tribal member's own opinion, though mostly think said name as [ancient, old-fashioned name].}