The following mainly comes from initial traditional tribes in general, not including tribes who have mixed origins and other case-by-case variable exceptions.
As one of the nine foundational tribes, the [Blackmud Demon Tribe] were initially as several of separated underground-living tribes who had associated customs on mineral-mining and clay-craftmanship, sometimes mining dust crystals for exchanging other daily essentials such as food and clothing. After receiving their own Grimm-form and then returning to their own tribal homelands in Anima, they started to build and spread out their own influence range by both building the increasing numbers of a series of their large-scale underground settlements by utilizing their own Grimm-form abilities and developing their own material production methods such as Dust-farming techniques(by mixing certain mixture of several potion formulas and nutritious-rich soil with certain amounts of dust crystal's fragments while using their own Grimm-form abilities as additional assistance of help for further mixing [footnote: only just mixing and no any catalytic effect on dust crystal production.] firstly, then laid said mixture flat on the ground in underground caves and there will have multiple-doubled amounts of dust crystals to be collected, which are produced from said ground after a while later) and extensive trading scale such as having their own trading market for exchanging various goods with other eastern (Anima) Grimm-folk tribes, such as [Perfume succubus] tribes, [Darkvine plantman] tribes, and [Six-arms demon] tribes. When around the beginning of first mistral empire era, after their several interactive contacts with members of Mistral's Four underworld families (especially Southern clan as their first interactive object), not only share their own Dust-farming techniques along with other associated unique material production methods with the members of Mistral's Four underworld families, but also many of [Blackmud Demon] tribal members have shown their own interest on Mistral's Four underworld families and participated under the ruling structure of Mistral's Four underworld families. And then during the period between first mistral empire era and second mistral empire era, many of [Blackmud Demon] tribal members were already lived under the ruling structure of Mistral's Four underworld families, particularly in {Southern clan}, {Eastern clan}, and {Northern clan}, though in case of {Northern clan}, certain amount of [blackmud demon] tribal members have left the northern clan of Four underworld families and return to their original states as independent tribal entities when in later period of second mistral empire era. Finally, after the implementation of "nighttime-wandering order", there are no any significant impacts on their tribal daily lives, and still continue to manage their underground Dust-farming fields (despite having few incidents about certain outside world's individuals accidently breaking into [blackmud demon] tribal's Dust-farming fields), trading commercial goods with other eastern (Anima) Grimm-folk tribes, and there are also several individuals have their own tour on certain large-scale underground urban district of {Eastern clan}'s Grimm-folk tribal members below the {Eastern clan}'s said turf, and even some, especially younger individuals, move up to land surface and have some life experiences of living among Mistral's civilian daily lifestyles.
[Grimm-form appearance]
In said stage form of Grimm-form transformation, aside from "turning their sclerae's color from white into black" along with their iris will glow at a certain level, single wavy black mud-like linear stripe is appearing and growing under each eye of said user and extend to jaw outline in vertical-symmetrical patterns on face.
In said stage form of Grimm-form transformation, aside from these above-mentioned appearance characteristics, a black wavy vertical fish-bones-shape tattoo also is appearing and growing on said user back as well as single wavy black mud-like linear stripe from upper part of the limbs spread to full-painted at the end of the limbs.
[Grimm-form ability]
In said Grimm-form, aside from negating Grimm's sense and mask said users’ "human/soul presence", making the said user 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 said user and having enhanced said user’s basic physical properties (including strength and durability) that allow them to have similar equal footing with huntsmen and huntress, said user also able to generate the blackish-purple mud-texture substance made of Grimm-like matter which is come from wavy stripes on the said users’ body, and not only manipulate said mud-texture substance at will, but also change said mud-texture substance’s texture (e.g. hardness, adhesive) and density (e.g. becoming more solidified) and shapeshift into various shapes (from simple ones like sphere and cube to complex ones like giant hand and giant wave) and objects (including but not limited to rope, grappling hook, spiked mace, mallet, gauntlet, shield and even sharped objects like axe and sword) at will, also said user can be able to use said mud-texture substance to wrap around said user's limbs ( e.g. wrapping Grimm-like matter-made blackish-purple mud-texture substance around either said user's arms and hand to form large size (sometime spiked) vambraces and gauntlets, said user's shins and feet to form large size (sometime spiked) shin armors and sabatons, or both, in order to increase striking power) or even entire body ( e.g. forming either hardened full-body-cover armor or giant-size mud-like humanoid entity where said user is encased inside said entity) for further enhancing said user's physical defense, striking power and attack range.
In more advanced usage of said Grimm-form's abilities, said user can be able to manipulate said mud-texture substance in midair without any contact with said users' body and manipulate said mud-texture substance in more precision manner such as "forming very tiny, straight hardened needle in midair with minimum amount of said mud-texture substance, and then launching said needle and sending it flying several kilometers away, and hitting smaller target at several kilometers range from said user", and some talented user even be able to create and manipulate mud-like (either humanoid-shaped or animal-shaped) pseudo-independent entity puppet from said user's certain distance.
Besides, said user also has access to regenerative healing capability that able to heal up multiple continued bone fractures along with at least two to three deep piercing wounds on chest caused by large spear, though these wounds which are higher than above mentioned wounds need additional amount of medical care for the purpose of accelerating the healing process. Besides, regenerative healing performance in completed form of Grimm-form transformation is slightly better than in partial form of Grimm-form transformation, if not better than [Darkvine plantman] and [Tree swinging fabric-strip demon].
In addition, said user utilizes their own ability of manipulating Grimm-like matter-made blackish-purple mud-texture substance which the said user generate themselves with mixing certain ingredients (e.g. certain minerals or ores) in order to create certain products, and the following created products are including:
Creatures-of-Grimm-awareness-reducing object: (created by mixing Grimm-like matter-made blackish-purple mud-texture substance with some clay and rocks, and then formed in solid form after air-drying and solidification. While said items no longer have any properties of being controlled and manipulated by said user (whether said item is within said user’s range or nor), said items only remain one property of passively absorbing the nearby aura within certain area (while not over-absorbing any beings’ aura at all, only very extremely few amount of it (about 0.000001%) being absorbed if it really happens). Said items are mainly used as exterior preventive “invisible” defensive barrier of the tribal settlement to prevent any Creatures-of-Grimm get too close to their settlement)
Supporting constructional earthquake-proof pillar: (created by mixing Grimm-like matter-made blackish-purple mud-texture substance with some clay and rocks along with huge portion amount of metal sand and fungus fiber, and then formed in solid form after air-drying and solidification, the reinforced concrete part of said pillar will be remained in said solid shape and stayed in certain settled position when Grimm-like matter-made blackish-purple mud-texture substance (from both interior and exterior) self-evaporated completely after a while. Said objects are usually used for supporting and strengthening cave ceiling part on top of their subterranean settlement in order to prevent collapsing on their own subterranean settlement which caused by earthquakes, and the said pillar is strong enough to receive high amount of earthquake occurrence within around two to three centuries.)
blackish-purple clay sculpture: (created by mixing Grimm-like matter-made blackish-purple mud-texture substance with some clay along with adding few some liquids (including water), and then paint some of bioluminescence-substance-included color paints on exterior layer of said clay sculpture as additional decorations after formed in solid form after air-drying and solidification. These clay sculptures have highly artistic values among the Grimm-folk tribes and other associated groups like "Four underworld families" and some nobilities and even royal family's members form both First and second Mistral empire due to the unique and divisive colorations and outer curves on these clay sculptures, and also are considered as "must-be-collected artistic collectives" by those who value those clay sculptures.)
blackish-purple alloy armor: (created by mixing Grimm-like matter-made blackish-purple mud-texture substance with huge portion amount of various types of metal sand, and then after said mixture is heated and melted, then heated said melted mixture up into soften form of said mixture and forged into a specific shape, and then cooled and solidified. Said alloy not only can be stored permanently and have akin-to-metal-plate properties that able to provide exceptional protection against the melee (e.g. mace and mallet) and ranged weapons (e.g. concentrated volley of rifle-fired bullets), but also can able to withstand longer period of receive extended amount of anti-Grimm-like-matter substances (e.g. "Jade-metal", Silver-eyes energy, "Brighting-silver" and "Moon-shiring herbs").)
[notice; Grimm-like matter-made blackish-purple mud-texture substance which the said user generate will be self-evaporated after a while once said substance is outside the said user’s control range and no longer be manipulated by the said user within a while. Even for these finished items made of Grimm-like matter-made blackish-purple mud-texture substance which are used to be stored permanently, as long as there have Grimm-like-matter substances be remained and contained within these items, these items will be self-evaporated in more rapid way once they are broken.]
Combat Application:
When fighting as individual, asides from wrapping Grimm-like matter-made blackish-purple mud-texture substance around either said user's arms and hands to form large size vambraces and gauntlets, said user's shins and feet to form large size shin armors and sabatons, or both, for striking said opponent directly, said user also can uses Grimm-like matter-made blackish-purple mud-texture substance to form various shape like giant-size hand/fist (sometimes leg/foot) and whip-like tentacle, and then stretches those things to strike/smash/swing said opponent away, and even garbs said opponent for throwing away later. Also, said user can use Grimm-like matter-made blackish-purple mud-texture substance to form and then harden into various shapes of weapons like spiked mace (for striking/smashing) and axe (for cutting/chopping) for attacking purpose, and use some dust crystals to be embedded into their own created mud weapons for further attack effect. Besides, said user can use Grimm-like matter-made blackish-purple mud-texture substance to form the rope to either tripping said opponent over, striking said opponent, garbing and throwing said opponent (sometimes weapons said opponent carried) away, or (in more lethal way) wrapping and choking around said opponent's neck for eventual suffocation.
Besides, said user can use Grimm-like matter-made blackish-purple mud-texture substance to form and then increase the hardness and density to form protective barrier (from personal shield to defensive wall, and then to 360-degree all-around defense hemisphere barrier), and also increase further hardness and density to a point of being able to withstand multiple volleys of rifle-fired bullets.
In addition, said user throw (sometimes use Grimm-like matter-made blackish-purple mud-texture substance formed tentacle to throw) the (either harden or nor) projectile (from simple ones like a (sometimes several) ball and bolt to complex ones like throwing and huge pile of mud) to either strike said opponent, or throw adhesive projectile to encase said opponent, and sometimes launches a stream of Grimm-like matter-made blackish-purple mud-texture substance at said opponent to either wash said opponent away, encase said opponent, or (in more lethal way) cover and trap said opponent entirely to either suffocate or crush said opponent. Moreover, Said user generate the Grimm-like matter-made blackish-purple mud-texture substance from said user’s lower limbs (e.g. legs or feet) to create in form of sort of giant wave/ jet stream while launching and pushing himself away in order to increase said user’s mobility, and sometimes use Grimm-like matter-made blackish-purple mud-texture substance to form rope (sometimes grappling hook) to attach certain solid surface to swing into another place.
Lastly, aside from using said mud-texture substance to wrap around said user's entire body for forming either hardened full-body-cover armor or giant-size mud-like humanoid entity where said user is encased inside said entity for further enhancing said user's physical defense, striking power and attack range, said user also can create and manipulate mud-like (either humanoid-shaped or animal-shaped) pseudo-independent entity puppet from said user's certain distance, and then use said puppet to fight for said user himself.
When fighting as group, they tend to have several persons use Grimm-like matter-made blackish-purple mud-texture substance to create and form either defensive cover or protective barrier for the purpose of providing protection to other people, then other use Grimm-like matter-made blackish-purple mud-texture substance to create either melee weapons for later close-up fight or projectiles for long range combat.
Besides, while several persons use Grimm-like matter-made blackish-purple mud-texture substance to create and form either defensive cover or protective barrier for creating defensive frontline, other generate the Grimm-like matter-made blackish-purple mud-texture substance from said user’s lower limbs (e.g. legs or feet) to create in form of sort of giant wave/ jet stream while launching and pushing themselves away in order to increase their mobility for flanking maneuver.
Besides, in terms of more rare ones, once they identify the possible tunnel route within subterrain environment for the certain hostile force passing through, the certain people will utilize their own Grimm-form ability of mud-texture substance they generated for cracking and digging out certain underward hole prematurely within subterrain environment (e.g. digging a certain size hole between rock strata A and B) for using as set-up trap, and then they use the remaining rocks after they digging out and utilize their own Grimm-form ability of mud-texture substance they generated to gather and glue said these rocks together for temporally filling up said hole as well as holding up said these rocks, which make the appearance of uncollapsed subterrain tunnel route, while the others stay hide in any hide-able positions at nearby surrounding set-up trap area. Once the certain hostile force passing through within set-up trap area, the ones who use their own Grimm-form ability for holding up said these rocks will release their control on mud-texture substance they generated and then cause the floor and certain hostile force within set-up trap area fall under into another rock strata. And lastly those in hide-able position will come out, encircle and attack the certain hostile force from every sides.
note: the said above-mentioned tactics could be countered by let certain one be as scout by utilizing their own Grimm-form ability of mud-texture substance they generated to creating wide and needle-thin layer of mud-covering prematurely for covering the surrounding area (e.g. within subterrain tunnel) in order to sense and scout out whether there are any cracks (as well as possible set-up trap position) within said area, and then said scout will inform said group about the scouting result for following action planning.
[Societal Aspects]
Firstly, within the core family groups of [Blackmud Demon] tribe, there are including tribal leader, who called "Cyan-gleam chief" by [Blackmud Demon] tribal member due to the cyan-as-main-colored attire said chief wear, along with their own family and their closest relatives. As the "Cyan-gleam chief", not only is responsible for managing and overseeing their own tribal matters, but also involving in several decision makings including holding (both civil and war) council meeting with other their high ranked tribal members, distributing and redistributing tribal resources (e.g. farm-able fields for either dust crystals or food, stored food and equipment, provide-able dust crystals, craft-able materials, and even available trading goods) and even some diplomatic matters with other [Blackmud Demon] tribes. Also, the family members and closest relatives of the "Cyan-gleam chief" will be participated as advisers to their tribal leader during tribal council meeting. Besides, in case of said tribal core family haven't any descendants, the position of "Cyan-gleam chief" not only will usually be succussed on either their closest collateral relatives, but also will be succussed on a high-ranking child from other related lineages such as the ones from either elite warrior family groups, tribal priest family groups or trader family groups.
Secondly, within the sub-tribal family groups of [Blackmud Demon] tribe, aside from the tribal priest who called "stone-oather" by [Blackmud Demon] tribal member, there are also including veteran/elite warrior who called "the oreblooded" by [Blackmud Demon] tribal member, specialized craftsman in using their own Grimm-form ability to certain specific products who called "blackclay-crafter" by [Blackmud Demon] tribal member, scholar, trader along with other specialized roles including blacksmith. Among these sub-tribal family groups, "stone-oather", "the oreblooded", "blackclay-crafter", scholar and trader are be considered as highly regarded tribal roles that can be able to participate as advisor during "Cyan-gleam chief" 's council meeting, and then while "blackclay-crafter", scholar and trader usually participate in tribal civil meeting, "the oreblooded" mainly participate in tribal war meeting [, there are no any specifications for "stone-oather" on what kind of "Cyan-gleam chief" 's council meeting is needed to participate to, though they tend to historically participate in tribal civil meeting]. While other specialized roles including blacksmith aren't thought as lesser ones, though they are generally just slightly lower among these sub-tribal family groups. In this following, these five tribal roles will be in more detailed form:
"stone-oather": responsible for tribal religious matters, such as holding certain religious rituals, maintaining tribal worshipping shrine they built along with statues for their worshiped deities, teaching and preserving their tribal mythological lore and tribal oral history including their own tribal origin, and even holding tribal festival celebration, and sometimes use bioluminescence-substance-included (especially cyan) color paints to create cave-wall paintings on further position from their own tribal settlement both as marking of their own tribal territory perimeter, as demonstration of their own tribal history and as ritualic measure for ensuring to have more blessing to their own tribe.
"the oreblooded": charactered by war paints that utilize geological element as outline shape and theme be painted on full body by using bioluminescence-substance-included cyan color paints, not only being as their tribal main fighting force as well as leading their own militia force, but also being as elite bodyguard for "Cyan-gleam chief" and the chief's own family members and closest relatives. For "the mudblooded" (aka the militia member) to become "the oreblooded", not only able to defeat several "the oreblooded" in martial duels as proof of said person's both physical and martial capabilities, but also have both approvements from "Cyan-gleam chief" 's family members and "the oreblooded" 's members as well. When joining "the oreblooded", not only have better privilege (e.g. having larger farm-able fields and better residences) and protective gears such as lamellar armors or brigandines, hardhat-shaped helmet, "Pig-Faced" (clay/metal-made) mask that Internally fill wet vinegar clothes on mouth and nose position for respiration in poisonous-gas-filled subterranean environment, but also able to receive more specific military education and more advanced martial training that is only be taught within "the oreblooded" group.
"blackclay-crafter": said tribal role's position are quite similar to both artmaker and builder, responsible for utilizing their own Grimm-form ability of manipulating Grimm-like matter-made blackish-purple mud-texture substance which the said user generate themselves along with mixing certain ingredients (e.g. certain minerals or ores) in order to create certain unique products such as Creatures-of-Grimm-awareness-reducing objects, blackish-purple alloy armor and even blackish-purple clay sculpture, and even sometimes responsible for building, maintaining and repairing the supporting constructional earthquake-proof pillar and other similar structures within their tribal settlement.
scholar: characterized by wearing blue-colored hood with various colored patterns on edge, they are well-known on various (natural, medical, chemical and even alchemical related) knowledge, keeping recordings of such knowledges in well-preserved status, and also are responsible for studying, researching and inventing everything beneficial for their tribal survival, such as "glowing spring-water" for providing enough amount of bright light for food production and cavern lighting, dust-farming potion formulas and associational techniques for enhancing and improving farmed dust crystal generational amount and quality of each dust crystal types, along with various subterrain agricultural, husbandry and aquacultural production methods and other various material production methods for enhancing and improving both food and material production in subterrain environment.
trader: responsible for holding, managing and overseeing commercial activities including trading for their own tribe, and they usually organize, set up and maintain the marketplace for trading purpose, settling and enforcing bartering rule within the marketplace, and even sometimes will arrange some "the mudblooded" for safeguarding the marketplace. While they are allowed by "Cyan-gleam chief" to keep various goods as their own personal commercial properties, they still usually give a portion of what they have in commercial activities to their tribal chief (especially in Chief's storehouses).
Lastly, within the lower-rank family groups of [Blackmud Demon] tribe, there are including farmer (for both dust-farming, crop-farming and livestock raising), digger, miner, fisherman, and even the hunter. While they usually give a portion of what they have in daily activities to their tribal chief (especially in Chief's storehouses) and sometimes served as militia, the "Cyan-gleam chief" will provide a portion of resources (including and equipment) as well as protection and hold occasional feasts and celebrational events in return on the lower-rank family groups' contributions on their own tribe.
(Special tribal role: blackshell brawlers, whose social status are around between the sub-tribal family groups and the lower-rank family groups of [Blackmud Demon] tribe, are dueler-type warrior that have their own origin that tracked back to single combat practice around prehistorical period of Mistral. They usually choose in cave basin space as their settled fighting space and get themselves inside the previous-and-custom-made empty shell of giant-size plate armors (usually in either humanoid, animal, or even those inspired from the creatures of grimm as well) whose joints tied with chains, which are made of blackish-purple alloy by "blackclay-crafter" using at least months if not years, and then use their own Grimm-form ability to generate mud-texture substance to wrap around said user's entire body to fill any empty space within the giant-size plate armors in, for allow giant-size mud-like entity they made to "wear" the armor while moving around and fighting. And whoever 's armor along with the giant-size mud-like entity still mostly remain in cave basin space will be considered as the winner. Originally as solving method for conflict between intertribal matters, this fighting event not only gain the attention of the other Grimm-folk tribes and Clan leader and their family members of "Four underworld families", but also some nobilities and even royal family's members form both First and second Mistral empire as well that there had set up temporary arena within certain imperial-owned residence on the surface for blackshell brawlers' fighting event which only members of the Mistral empire's royal family can watch, therefore become more as entertainment event for both inside and outside the [Blackmud Demon Tribe], and then there are some even still hold said fighting in smaller-scale arena they set up in more commercial form within large-scale underground urban district below the {Eastern clan}'s said turf in current days.)
[Cultural Aspects]
In terms of residence, their house's shape is usually in hemisphere shape for as the prevention of being collapsed by the earthquake and made of similar materials which use similar method to making supporting constructional earthquake-proof pillar's one, except using more earth material ratio, along with interior-installed covering blinds made of certain fungus fibers they cultivated for both doorway and windows. And then, the higher tribal status the tribal members have, having large and a greater number of private rooms of said house where the tribal members live. Besides, exterior layer of the house where the tribal members who have the higher tribal status tends to use more varieties of bioluminescence-substance-included color paints and patterns on their residence's walls than those who have the lower tribal status, and especially in case the residence where the tribal core family groups live, their residence's walls are painted with a higher ratio of bioluminescence-substance-included cyan color paints, as the color of cyan is considered as one that having higher connection with divine and spiritual energy (as well as the same color as hardlight dust crystal due to being one that still have difficulty on mass production of farmed hardlight dust crystals compare to other types of dust crystals as there are still limitations on their current development on both Dust-farming potion formulation and Dust-farming techniques), and said features also are applied on interior wall design as well. Furthermore, in terms of stuffs inside the subterrain residence, not only have campfire place for both warming and cooking purposes (along with breathing holes above the fireplace) in central position of said residence, but also have sleeping mats with sleeping bags, low-legged table, several storage baskets along with some of item holding hook on wall surrounding the campfire place.
In terms of tribal settlement, their tribal settlement is usually settled within (either be natural or be artificial by utilizing their own Grimm-form ability of mud-texture substance they generated for cracking and removing any boulders and rock walls within said cavern space) large subterrain cavernous space, residences for "Cyan-gleam chief" along with their own family and their closest relatives are placed within the central position of their tribal settlement, and then several essential tribal facilities (including chief's storehouses, crafting shops, armories, cleared central tribal plaza (for various purposes including military training and gathering for receiving news of tribal council's important decision), public bathing pool areas) are surrounding nearby the central position of their tribal settlement, following with surrounded by medium-sized residences lived by their own sub-tribal family groups where several smaller residences lived by their own lower-rank family groups are nearby, after that there are several installed defensive structures (e.g. bunkers) and earthworks (e.g. trenches) at The outermost edge of said tribal settlement for the protection on said tribal settlement from exterior threats (e.g. attackers from other Grimm-folk tribes, and even creatures of Grimm which sometimes accidentally run into nearby said tribal settlement), along with an additional outer layer of the line of full of scattering installed Creatures-of-Grimm-awareness-reducing objects (in form of both cobble in certain hidden position and being embedded within cave) as primary “invisible” preventative and defensive measures for preventing any Creatures-of-Grimm get too close to said tribal settlement, as well as the cave-wall paintings on further position from their own tribal settlement as the marking of their own tribal territory perimeter. And in terms of farming fields (either dust-farming or crop-farming) and other associated areas (including aquaculture and livestock raising), they are usually spreading around (both within and outside, as well as above and below) the said tribal settlement, and the worshipping shrines, usually in form of tiny wooden/stone house model, are mostly installed outside, sometimes within, the said tribal settlement (, the higher tribal status the tribal members have, having larger fields (for both dust-farming and crop-farming) they owned, additionally the dust-farming fields, especially the ones which have large amount of hardlight dust crystals are traditionally owned by "Cyan-gleam chief" along with their own family members). And lastly, their own marketplaces are settled in faraway but not too far position from their own tribal settlement, with placing full of street-style stalls held by [Blackmud Demon] tribal members around the place, along with several glass/certain-semitransparent-fungus-matter-made vassal filled with "glowing spring-water" on stone/certain-harden-fungus-matter-made holder placed in middle of the marketplace for lighting purpose.
(footnote: after the implementation of "nighttime-wandering order", certain portions of the marketplaces the [Blackmud Demon] tribes settled become in more permanent fashion, and even some of tribal members have established sort of tavern (including several mats with some pillows for sitting and eating as well as the bar table), and even hot-bathing relaxing zone (including several hot bathing pools(heated by fire-dust-heated stones along adding some cave-mining minerals into the said pool water as for further healing effect, and also with some inn facilities and some amenities (including vending machines provided from some of their own [Blackmud Demon] relatives and friends from {Eastern clan}) nearby the marketplace currently.)
In terms of food source, aside from various edible mushrooms, mosses, lichens and other cave-living plants (e.g. an unique edible plant called "barked roots" which has a series of large and deeper edible root-appeared stems and has tendency of wrapping around the cave-rocks including stalactites) along with insects (e.g. bread-worms), vermicultures (e.g. earthworms), mollusks (e.g. slugs and snails), cave-living aquatic creatures (e.g. blind crayfish and blind eels) and cave-living amphibians (e.g. frogs and olms) since when be eaten by their own ancestors, they also eat root vegetables (e.g. taro and sweet potato), green-vegetables (e.g. cabbage), beans, algae, poultries (e.g. chickens and quails) along with their-laid eggs, and other small livestock (e.g. rabbit and certain guinea-pig-like rodent ones called "abyss-chubber"). In terms of cooking method, aside from raw consumption like what their ancestors did, they also cook above-mentioned food sources in various methods like earth oven baking, stewing, thermal boiling, roasting and plate-grilling, seasoned with rock salt which is mined from deep under places below the Anima's inland sea and other spices from trading sources, along with preserve said food in these methods like curing and fermenting.
These following dishes are quite common among the [Blackmud Demon] tribal people:
In terms of beverage, they mainly drink juice (along with some fermented and even alcoholic version ones among the juice), which from either pulverated mushrooms, taro or sweet potato, in a clay-bowl for drinking purpose.
(footnote: certain food, such as some kinds of giant-sized cave-living giant amphibians including certain salamander-like ones called "deepspring-sleeper" and certain olm-like ones called "cavelake-swifter", are only for "Cyan-gleam chief" along with their own family members allow to eat and only in certain festivals when is only time that everyone in their own tribe are allowed to eat above-mentioned foods. Also, daily products like goat cheeses and milk mostly come from imported trading sources. Besides, certain food, such as desserts and baking goods like breads and cakes, are considered by their tribes as rarities along with only eat those in certain festivals due general lack of sweeteners and enough flours for making large quantities of baking goods in subterranean environment.)
(footnote: some food source, including root vegetables and poultries, were later introduced into their tribes at least during the period between first mistral empire era and second mistral empire era.)
In terms of recreation, aside from above-mentioned blackshell brawlers' arena fight, as well as these common ones among eastern (anima) Grimm-folk tribes such as dual sparring, wrestering and spear throwing, they also play various ball games, which among two of them being most popular among [Blackmud Demon] tribal members: 'rolling cave-floor balls' [while using a drawn colored circle at middle central position along with surrounding several random-placed cones as obstacles as the field setting, the players must throw the certain-fungus-leather-made balls once of the certain times at a colored circle (while being forbidden for throwing the balls into the said drawn colored circle straightly and directly) as closer as possible in shorter amount of time (while also can use these random-placed cones for bouncing platform to get even closer at a colored circle), and whoever is most closer at a colored circle within shorter amount of time] and 'cave-basin handball' [while using a basket which its bottom part is hold on stone/certain-harden-fungus-matter-made holder at middle central position placed on a drawn colored circle on lower part of cave-basin as the field setting, the (about 5 to 6) players from two teams who alternate between the offense and the defense across certain limited sections, that the ones in offense need to score by (only either using hands or using their own Grimm form's single mud-like tentacle)throwing the certain-fungus-leather-made ball (while keeping the said ball midair to avoid the said ball touching the ground) into the basket while the ones in defense need to guard (each one only either using hands or using their own Grimm form's single defensive wall) the basket within said drawn colored circle for preventing those in offence get scored three times (1 score per throwing the ball into the basket) within specific limited time limit in each section, as well as the ball must not keep within the said drawn colored circle and must give the ball back to the ones in offense, and lastly the team with the highest score after the certain limited sections are considered as winning team]. Beyond these above-mentioned sports, they also do clay crafting, weaving, sculpture making, playing music instruments such as clay-flute and hand-drum (made of clay-pot (as drum-shell) and animal skins and hides/ fibers either from plant or fungus sources (as drumhead)), playing board and tabletop games which come from the outside world like Mistral chess (aka chinese Weiqi) and storytelling (especially on mythical ones) in their leisure times.
In terms of trading activity, they mainly use bartering system that utilize hardlight dust crystals which are from both mining source and farming source, as their tribal currency for exchanging various goods like food, clothing, tools, clay/metal-made items. Even though they started to utilize Lien currency from land surface after the end of the great war, they still use hardlight dust crystals as either alternative payment or in more personal exchange among their marketplaces.
In terms of clothing, their common tribal dressing (for both genders) are including thicken-cloth-made full-body-covered attires along with thicken-cloth-made hood hat, gloves, and a pair of bottom-metal-nailed leather boots which these cloths and leather are made of certain fungus fibers they cultivated for providing enough both on protection and breathability, along with a clay-made/paper-molded mask that Internally fill wet vinegar clothes on mouth and nose position for respiration in poisonous-gas-filled subterranean environment. Also, the clothing worn by the tribal members who have the higher tribal status tends to have more (sometimes using the bioluminescence-substance-included ones as well) colors and patterns varieties than those who have the lower tribal status, especially the one worn by "Cyan-gleam chief" which include the cyan (as main color) robe along with hemisphere-topped cone-shaped hat of same color. Besides they use various wearable ornaments as sign of differentiating each of their own individual tribe among the [blackmud demon] Grimm-folk, for example all (including those who are as young as birthed baby) members of certain tribe wear necklace which hang with a small red pearl-shaped ball, while those of other tribes wear a bracelet full of copper rings, a cyan-colored pendant on a rope, or a rainbow-colored metal bracelet respectively etc.
In terms of toolmaking materials, aside from natural materials such as stones, animal skins and hides, animal bones, animal teeth, fibers (both from plant and fungus sources), organic substances (which are mostly from fungus sources), dust crystals, and several earth substances including sand, dirt and clay (which are dig from around the subterranean cave), they also utilize metal from their own blacksmithing productions (albeit at relative limited amounts), and other materials including woods, cottons and wools which are imported from trading sources as well.
In terms of their usual go-to weaponry, aside from knifes and daggers (pushing dagger included), they also use short war-shovel (modified short shovel with sharped blade), short war-pickaxe, short mace, short war-hook, short sword and short spear for melee fight, and use throwing knifes, short throwing spears, stone/dust crystal-launching crossbow along with later-introduced explosive weapons (like primitive-style dust-crystal-infused hand grenades) and firearms (both pistol and carbine shotgun as being most popular among the [Blackmud Demon] tribes) for long range combat.
(footnote: crossbow along with later-introduced explosive weapons and firearms are introduced from trading sources mostly, especially from land surface between first and second mistral empire period)
In terms of religion, their own worldview is that both earth and rocks are the true source of strength and endurance which they have that create the world itself and the world is full of countless subterrain caves and tunnels (so massive that there is no such thing called "sky", only certain air-like cyan-energy flowing around the countless subterrain caves and tunnels), and then the deeper and more underward they go, the more closer to the "world's core" of strength and endurance they get. Aside from the common associations on earth and geology elements among the deities they worship, there are some deities who [Blackmud Demon] tribal members worship the most, such as "the bold builder" (in form as young-teen man whose domain are craftmanship, construction and tribal settlement, who is not only the one who from mere mortal to be divine deity once being contacting with the "world's core" of strength and endurance as the legend said, as well as first creator and builder of entire subterrain world and their own tribes themselves), "cave-mother"(in form as kind middle-age woman whose domain are life, food, clothing, health and community), "cyan-lord" (in form as full-on-body-cyan-colored-skin middle-age man whose domain are ore, trading and wealth), "black-old-miner" (in form as very-dark-skinned long-bearded pickaxe-holding full-muscled elder man whose domain are labor works (mining and digging included), blacksmith and war), "blue-caped wiser" (in form as blue-colored hood-wearing adult man whose domain are knowledge, wisdom, memory and alcohol) and "tunnel-airrunner"(in form as young and happy boy who is always smile on his face, as well as minor deity whose domain is providing safe subterrain travel for the travelers (mainly for [Blackmud Demon] tribal members)), and these above-mentioned deities are usually crafted in form of stone/clay-made sculptures for worshipping purpose. When certain [Blackmud Demon] tribal member visits the shrine of a certain specific deity, they usually appropriate offerings for their own deities they worship to (by putting into the bowl inside the shrine) for appropriate matters, for example few hard hardlight dust-crystals for "cyan-lord", few metal fragments for "black-old-miner" and few drops of fermented liquid for "blue-caped wiser".
In terms of festivals, despite having some number of festivals they held, there are following few important festivals that most of [Blackmud Demon] tribal members go to, for example "new-ore-day" hold at between two months of start of the new year when everyone will receive the pocket full of dust crystals (mostly hardlight dust-crystals along with other types of dust-crystals like fire and wind dust-crystals) provided by "stone-oather" (sometimes by "Cyan-gleam chief" himself) along with the grand feasts, and then "in-cave day" hold at around the end of the winter when everyone will come back into their own tribal settlement while having the grand feasts and chatting with their own tribal members along with exchanging various goods along with other items each other as gift .
In terms of mythological fictional creatures within their oral tribal folklores, despite having numerous amounts of mythological fictional creatures within their oral tribal folklores, there are some of fictional creatures which are most widespread among [Blackmud Demon] tribal members: {rockeating-goblin}[about half-of-the-shin-tall dirt-colored imp-like creature which is very extremely hungry that will eat anything rock-like inside the subterrain including gems, ore, metals and even dust-crystal as well], {emitting-smokeman}[shadowy humanoid figure who emit large amount of mist-like smoke before inhale and eat the lifeforces from anyone who breathe on said smoke with no protection at all], and lastly {tunnel-whisper}[rumored as sort of evil cousin of "tunnel-airrunner", who not only will guide the traveler in wrong direction malicious-intentionally through whisping, but also sometimes cause cave-collapse that endanger said traveler without any warning].