I've done a little modding this afternoon/evening and I give you standard demons to make hell more dangerous/frightening/Bad Ass !
creature_underworld
[OBJECT:CREATURE]
[CREATURE:SPIRIT_OF_FIRE]
[DESCRIPTION:A gigantic humanoid shape composed of fire. Infernal cousin of the Fire Man, it is much larger and much more dangerous than it. It takes great pleasure in burning everything flammable it can reach]
[NAME:spirit of fire:spirit of fire:spirit of fire]
[CASTE_NAME:spirit of fire:spirits of fire:spirit of fire]
[CREATURE_TILE:'&'][COLOR:4:0:1]
[INTELLIGENT]
[DEMON]
[SPHERE:FIRE]
[SPHERE:WAR]
[SPHERE:CHAOS]
[DRAGONFIREBREATH][FIREIMMUNE][EVIL][FLIER][LIKES_FIGHTING][MAGMA_VISION]
[LARGE_ROAMING][FIREIMMUNE_SUPER][IMMOLATE]
[BIOME:SUBTERRANEAN_CHASM]
[UNDERGROUND_DEPTH:5:5]
[FREQUENCY:75][DIFFICULTY:10]
[POPULATION_NUMBER:100:300]
[CLUSTER_NUMBER:5:10]
[NOPAIN][EXTRAVISION][NOBREATHE][NOSTUN][NONAUSEA][NOEMOTION][TRAPAVOID]
[NO_DIZZINESS]
[NO_FEVERS]
[FIXED_TEMP:12000]
[BUILDINGDESTROYER:2]
[LARGE_PREDATOR]
[NO_DRINK][NO_EAT][NO_SLEEP]
[CANNOT_UNDEAD]
[CANOPENDOORS]
[NOT_BUTCHERABLE]
[NOFEAR]
[PREFSTRING:ardent majesty]
[PREFSTRING:burning terror]
[PREFSTRING:nostalgia]
[NOBONES]
[SPEED:500]
[BODY:HUMANOID_SIMPLE]
[NO_THOUGHT_CENTER_FOR_MOVEMENT]
[USE_MATERIAL_TEMPLATE:FLAME:FLAME_TEMPLATE]
[MAT_FIXED_TEMP:10800]
[USE_TISSUE_TEMPLATE:FLAME:FLAME_TEMPLATE]
[TISSUE_LAYER:BY_CATEGORY:ALL:FLAME]
[BODY_SIZE:0:0:2000000]
[BODY_APPEARANCE_MODIFIER:HEIGHT:90:95:98:100:102:105:110]
[BODY_APPEARANCE_MODIFIER:BROADNESS:90:95:98:100:102:105:110]
[ATTACK:PUNCH:BODYPART:BY_TYPE:GRASP]
[ATTACK_SKILL:GRASP_STRIKE]
[ATTACK_VERB:punch:punches]
[ATTACK_CONTACT_PERC:100]
[ATTACK_FLAG_WITH]
[ATTACK_PRIORITY:MAIN]
[ATTACK:KICK:BODYPART:BY_TYPE:STANCE]
[ATTACK_SKILL:STANCE_STRIKE]
[ATTACK_VERB:kick:kicks]
[ATTACK_CONTACT_PERC:100]
[ATTACK_FLAG_WITH]
[ATTACK_PRIORITY:SECOND]
[ITEMCORPSE:BAR:NO_SUBTYPE:ASH:NO_MATGLOSS]
[ALL_ACTIVE]
[SWIMS_INNATE][SWIM_SPEED:2500]
[CREATURE:OBSIDIAN_COLOSSUS]
[ARENA_RESTRICTED]
[DESCRIPTION:A gigantic humanoid statue made of obsidian, found in the deepest caves of the Underworld and said to be animated by pure evil. Nearly the equivalent of a bronze colossus in dangerosity]
[NAME:obsidian colossus:obsidian colossi:obsidian colossus]
[CASTE_NAME:obsidian colossus:obisidan colossi:obsidian colossus]
[CREATURE_TILE:'M'][COLOR:5:0:1]
[LIKES_FIGHTING]
[LARGE_ROAMING]
[SPHERE:STRENGTH]
[SPHERE:VOLCANOS]
[SPHERE:MOUNTAINS]
[BIOME:SUBTERRANEAN_CHASM]
[UNDERGROUND_DEPTH:5:5]
[FREQUENCY:75]
[POPULATION_NUMBER:150:300][DIFFICULTY:15]
[CLUSTER_NUMBER:1:10]
[NOBONES]
[NOPAIN][DEMON][INTELLIGENT][EVIL][EXTRAVISION][NOBREATHE][NOSTUN][NONAUSEA][NOEMOTION]
[NOTHOUGHT][NOEXERT]
[NO_DIZZINESS]
[NO_FEVERS]
[BUILDINGDESTROYER:2]
[LARGE_PREDATOR]
[NO_DRINK][NO_EAT][NO_SLEEP]
[CANNOT_UNDEAD]
[CANOPENDOORS]
[NOT_BUTCHERABLE]
[FIREIMMUNE][FIREIMMUNE_SUPER]
[NOFEAR]
[PREFSTRING:great size]
[PREFSTRING:colossal strength]
[PREFSTRING:glowing red eyes]
[BODY:HUMANOID_SIMPLE]
[NO_THOUGHT_CENTER_FOR_MOVEMENT]
[TISSUE:ROCK]
[TISSUE_NAME:obsidian:NP]
[TISSUE_MATERIAL:INORGANIC:OBSIDIAN]
[MUSCULAR]
[FUNCTIONAL]
[STRUCTURAL]
[RELATIVE_THICKNESS:3]
[CONNECTS]
[TISSUE_SHAPE:LAYER]
[TISSUE_LAYER:BY_CATEGORY:ALL:ROCK]
[BODY_SIZE:0:0:2000000]
[PHYS_ATT_RANGE:STRENGTH:2000:2500:3000:3500:4000:4500:5000]
[BODY_APPEARANCE_MODIFIER:HEIGHT:90:95:98:100:102:105:110]
[BODY_APPEARANCE_MODIFIER:BROADNESS:90:95:98:100:102:105:110]
[ATTACK:PUNCH:BODYPART:BY_TYPE:GRASP]
[ATTACK_SKILL:GRASP_STRIKE]
[ATTACK_VERB:punch:punches]
[ATTACK_CONTACT_PERC:100]
[ATTACK_FLAG_WITH]
[ATTACK_PRIORITY:MAIN]
[ATTACK:KICK:BODYPART:BY_TYPE:STANCE]
[ATTACK_SKILL:STANCE_STRIKE]
[ATTACK_VERB:kick:kicks]
[ATTACK_CONTACT_PERC:100]
[ATTACK_FLAG_WITH]
[ATTACK_PRIORITY:SECOND]
[ITEMCORPSE:ROUGH:NO_SUBTYPE:INORGANIC:OBSIDIAN]
[ALL_ACTIVE]
[CREATURE:HELL_IMP]
[ARENA_RESTRICTED]
[DESCRIPTION:A small flying humanoid, found in the deepest pits of the earth, that attacks in swarms. Not especially powerful alone, it however becomes deadly in groups.]
[NAME:hell imp:hell imps:impish]
[CASTE_NAME:hell imp:hell imp:impish]
[CREATURE_TILE:'i'][COLOR:4:0:0]
[LARGE_ROAMING]
[INTELLIGENT][EVIL][FLIER][LIKES_FIGHTING][TRAPAVOID][LARGE_PREDATOR]
[BIOME:SUBTERRANEAN_CHASM]
[UNDERGROUND_DEPTH:5:5]
[FREQUENCY:100]
[POPULATION_NUMBER:1000:2000]
[CLUSTER_NUMBER:20:100]
[PREFSTRING:maniacal laughter]
[PREFSTRING:terror-inspiring antics]
[PREFSTRING:swarming]
[BUILDINGDESTROYER:2]
[SPHERE:TRICKERY]
[SPHERE:DEPRAVITY]
[CURIOUSBEAST_EATER][CURIOUSBEAST_ITEM]
[BODY:HUMANOID:2WINGS:TAIL:2EYES:NOSE:2LUNGS:HEART:GUTS:ORGANS:HUMANOID_JOINTS:THROAT:NECK:SPINE:BRAIN:SKULL:4FINGERS:4TOES:MOUTH:2HEAD_HORN]
[BODY_DETAIL_PLAN:STANDARD_MATERIALS]
[REMOVE_MATERIAL:HAIR]
[REMOVE_MATERIAL:SKIN]
[REMOVE_MATERIAL:LEATHER]
[USE_MATERIAL_TEMPLATE:SCALE:SCALE_TEMPLATE]
[USE_MATERIAL_TEMPLATE:HORN:HORN_TEMPLATE]
[USE_MATERIAL_TEMPLATE:IVORY:TOOTH_TEMPLATE]
[STATE_NAME:ALL_SOLID:ivory]
[STATE_ADJ:ALL_SOLID:ivory]
[BODY_DETAIL_PLAN:STANDARD_TISSUES]
[REMOVE_TISSUE:HAIR]
[REMOVE_TISSUE:SKIN]
[USE_TISSUE_TEMPLATE:SCALE:SCALE_TEMPLATE]
[USE_TISSUE_TEMPLATE:HORN:HORN_TEMPLATE]
[USE_TISSUE_TEMPLATE:IVORY:IVORY_TEMPLATE]
[BODY_DETAIL_PLAN:VERTEBRATE_TISSUE_LAYERS:SCALE:FAT:MUSCLE:BONE:CARTILAGE]
[USE_MATERIAL_TEMPLATE:CLAW:NAIL_TEMPLATE]
[USE_TISSUE_TEMPLATE:CLAW:CLAW_TEMPLATE]
[TISSUE_LAYER:BY_CATEGORY:FINGER:CLAW:FRONT]
[TL_RELATIVE_THICKNESS:10]
[TISSUE_LAYER:BY_CATEGORY:TOE:CLAW:FRONT]
[BODY_DETAIL_PLAN:LEATHERY_EGG_MATERIALS]
[SELECT_TISSUE_LAYER:HEART:BY_CATEGORY:HEART]
[PLUS_TISSUE_LAYER:SKIN:BY_CATEGORY:THROAT]
[TL_MAJOR_ARTERIES]
[BODY_DETAIL_PLAN:STANDARD_HEAD_POSITIONS]
[BODY_DETAIL_PLAN:HUMANOID_HEAD_POSITIONS]
[BODY_DETAIL_PLAN:HUMANOID_RIBCAGE_POSITIONS]
[BODY_DETAIL_PLAN:HUMANOID_RELSIZES]
[USE_MATERIAL_TEMPLATE:SINEW:SINEW_TEMPLATE]
[TENDONS:LOCAL_CREATURE_MAT:SINEW:200]
[LIGAMENTS:LOCAL_CREATURE_MAT:SINEW:200]
[HAS_NERVES]
[USE_MATERIAL_TEMPLATE:BLOOD:BLOOD_TEMPLATE]
[BLOOD:LOCAL_CREATURE_MAT:BLOOD:LIQUID]
[CREATURE_CLASS:GENERAL_POISON]
[USE_MATERIAL_TEMPLATE:PUS:PUS_TEMPLATE]
[PUS:LOCAL_CREATURE_MAT:PUS:LIQUID]
[BODY_SIZE:0:0:30000]
[BODY_APPEARANCE_MODIFIER:HEIGHT:90:95:98:100:102:105:110]
[BODY_APPEARANCE_MODIFIER:BROADNESS:90:95:98:100:102:105:110]
[ATTACK:SCRATCH:CHILD_TISSUE_LAYER_GROUP:BY_TYPE:GRASP:BY_CATEGORY:FINGER:CLAW]
[ATTACK_SKILL:GRASP_STRIKE]
[ATTACK_VERB:claws:claws]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PENETRATION_PERC:100]
[ATTACK_FLAG_EDGE]
[ATTACK_PRIORITY:MAIN]
[ATTACK:PUNCH:BODYPART:BY_TYPE:GRASP]
[ATTACK_SKILL:GRASP_STRIKE]
[ATTACK_VERB:punch:punches]
[ATTACK_CONTACT_PERC:100]
[ATTACK_FLAG_WITH]
[ATTACK_PRIORITY:SECOND]
[ATTACK:KICK:BODYPART:BY_TYPE:STANCE]
[ATTACK_SKILL:STANCE_STRIKE]
[ATTACK_VERB:kick:kicks]
[ATTACK_CONTACT_PERC:100]
[ATTACK_FLAG_WITH]
[ATTACK_PRIORITY:SECOND]
[ATTACK:BITE:BODYPART:BY_CATEGORY:MOUTH]
[ATTACK_SKILL:BITE]
[ATTACK_VERB:bite:bites]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PRIORITY:MAIN]
[ATTACK_FLAG_CANLATCH]
[ALL_ACTIVE]
[SWIMS_INNATE][SWIM_SPEED:2500]
[HOMEOTHERM:10040]
[SELECT_CASTE:ALL]
[SET_TL_GROUP:BY_CATEGORY:ALL:SCALE]
[TL_COLOR_MODIFIER:BLACK:1]
[TLCM_NOUN:scales:PLURAL]
[SET_TL_GROUP:BY_CATEGORY:EYE:EYE]
[TL_COLOR_MODIFIER:BLACK:1]
[TLCM_NOUN:eyes:PLURAL]
[CREATURE:NIGHTMARE]
[DESCRIPTION:A demonic, gigantic black horse, with a flaming mane and hooves. It cannot be used as a steed, even by demons, but is a terrifying fighter in it's own right. Can also walk on air like on ground.]
[NAME:nightmare:nightmares:nightmare]
[CASTE_NAME:nightmare:nightmares:nightmare]
[CREATURE_TILE:'N'][COLOR:7:0:0]
[PREFSTRING:terrifying features]
[PREFSTRING:burning manes]
[LARGE_ROAMING]
[SPHERE:NIGHTMARES]
[SPHERE:STRENGTH]
[SPHERE:BLIGHT]
[SPHERE:FIRE]
[POPULATION_NUMBER:100:200]
[CLUSTER_NUMBER:10:30]
[BIOME:SUBTERRANEAN_CHASM]
[UNDERGROUND_DEPTH:5:5]
[DEMON][EVIL][INTELLIGENT][LIKES_FIGHTING][LARGE_PREDATOR][TRAPAVOID][BUILDINGDESTROYER:2][FIREIMMUNE][FIREIMMUNE_SUPER][MAGMA_VISION]
[NODRINK][NOEAT][NOFEAR][NOPAIN][FLIER]
[PRONE_TO_RAGE:10][SPEED:600]
[BODY:QUADRUPED_HOOF:TAIL:2EYES:2EARS:NOSE:2LUNGS:HEART:GUTS:ORGANS:THROAT:NECK:SPINE:BRAIN:SKULL:MOUTH:GENERIC_TEETH:RIBCAGE]
[NATURAL]
[BODY_DETAIL_PLAN:STANDARD_MATERIALS]
[USE_MATERIAL_TEMPLATE:HOOF:HOOF_TEMPLATE]
[BODY_DETAIL_PLAN:STANDARD_TISSUES]
[USE_TISSUE_TEMPLATE:HOOF:HOOF_TEMPLATE]
[USE_MATERIAL_TEMPLATE:FLAME:FLAME_TEMPLATE]
[USE_TISSUE_TEMPLATE:FLAME:FLAME_TEMPLATE]
[TISSUE_LAYER:BY_CATEGORY:THROAT:FLAME:TOP:BY_CATEGORY:SKIN]
[SELECT_MATERIAL:HOOF]
[STATE_COLOR:ALL_SOLID:ORANGE]
[DISPLAY_COLOR:4:0:1]
[FIXED_TEMP:14000]
[SELECT_MATERIAL:EYE]
[STATE_COLOR:ALL_SOLID:ORANGE]
[DISPLAY_COLOR:4:0:1]
[FIXED_TEMP:14000]
[BODY_DETAIL_PLAN:STANDARD_MATERIALS]
[USE_MATERIAL_TEMPLATE:HOOF:HOOF_TEMPLATE]
[BODY_DETAIL_PLAN:STANDARD_TISSUES]
[USE_TISSUE_TEMPLATE:HOOF:HOOF_TEMPLATE]
[BODY_DETAIL_PLAN:VERTEBRATE_TISSUE_LAYERS:SKIN:FAT:MUSCLE:BONE:CARTILAGE]
[BODY_DETAIL_PLAN:BODY_HAIR_TISSUE_LAYERS:HAIR]
[SELECT_TISSUE_LAYER:HEART:BY_CATEGORY:HEART]
[PLUS_TISSUE_LAYER:SKIN:BY_CATEGORY:THROAT]
[TL_MAJOR_ARTERIES]
[BODY_DETAIL_PLAN:STANDARD_HEAD_POSITIONS]
[BODY_DETAIL_PLAN:HUMANOID_RIBCAGE_POSITIONS]
[USE_MATERIAL_TEMPLATE:SINEW:SINEW_TEMPLATE]
[TENDONS:LOCAL_CREATURE_MAT:SINEW:200]
[LIGAMENTS:LOCAL_CREATURE_MAT:SINEW:200]
[HAS_NERVES]
[USE_MATERIAL_TEMPLATE:BLOOD:BLOOD_TEMPLATE]
[BLOOD:LOCAL_CREATURE_MAT:BLOOD:LIQUID]
[CREATURE_CLASS:GENERAL_POISON]
[USE_MATERIAL_TEMPLATE:PUS:PUS_TEMPLATE]
[PUS:LOCAL_CREATURE_MAT:PUS:LIQUID]
[BODY_SIZE:0:0:700000]
[BODY_APPEARANCE_MODIFIER:LENGTH:90:95:98:100:102:105:110]
[BODY_APPEARANCE_MODIFIER:HEIGHT:90:95:98:100:102:105:110]
[BODY_APPEARANCE_MODIFIER:BROADNESS:90:95:98:100:102:105:110]
[ATTACK:KICK:BODYPART:BY_CATEGORY:HOOF_FRONT]
[ATTACK_SKILL:STANCE_STRIKE]
[ATTACK_VERB:kick:kicks]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PRIORITY:MAIN]
[ATTACK_FLAG_WITH]
[ATTACK:KICK:BODYPART:BY_CATEGORY:HOOF_REAR]
[ATTACK_SKILL:STANCE_STRIKE]
[ATTACK_VERB:kick:kicks]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PRIORITY:SECOND]
[ATTACK_FLAG_WITH]
[ATTACK:BITE:CHILD_BODYPART_GROUP:BY_CATEGORY:HEAD:BY_CATEGORY:TOOTH]
[ATTACK_SKILL:BITE]
[ATTACK_VERB:bite:bites]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PENETRATION_PERC:100]
[ATTACK_FLAG_EDGE]
[ATTACK_PRIORITY:MAIN]
[ATTACK_FLAG_CANLATCH]
[NOCTURNAL]
[HOMEOTHERM:10068]
[SWIMS_INNATE][SWIM_SPEED:2500]
[MALE]
[SELECT_CASTE:ALL]
[SET_TL_GROUP:BY_CATEGORY:ALL:HAIR]
[TL_COLOR_MODIFIER:BLACK:1]
[TLCM_NOUN:hair:SINGULAR]
[SET_TL_GROUP:BY_CATEGORY:ALL:SKIN]
[TL_COLOR_MODIFIER:BRONZE:1]
[TLCM_NOUN:skin:SINGULAR]
[SET_TL_GROUP:BY_CATEGORY:EYE:EYE]
[TL_COLOR_MODIFIER:ORANGE:1]
[TLCM_NOUN:eyes:PLURAL]
[CREATURE:HELL_HOUND]
[DESCRIPTION:A larger, demonic, fire-breathing version of the common dog. It is used by larger demons as a hunting animal, and especially likes to torment mortals]
[NAME:hell hound:hell hounds:hell hounds]
[CASTE_NAME:hell hound:hell hounds:hell hound]
[CREATURE_TILE:'d'][COLOR:6:0:0]
[LARGE_ROAMING]
[EVIL][CAN_LEARN][DEMON][LIKES_FIGHTING][NOFEAR][NOPAIN][LARGE_PREDATOR][CURIOUSBEAST_EATER][TRAPAVOID][BUILDINGDESTROYER:2][FIREIMMUNE][FIREIMMUNE_SUPER][FIREBREATH]
[PRONE_TO_RAGE:10][SPEED:700]
[BONECARN]
[SPHERE:NIGHT]
[SPHERE:FIRE]
[SPHERE:HUNTING]
[POPULATION_NUMBER:200:750]
[CLUSTER_NUMBER:10:50]
[BIOME:SUBTERRANEAN_CHASM]
[UNDERGROUND_DEPTH:5:5]
[PREFSTRING:barks and howls]
[PREFSTRING:pack hunting]
[BODY:QUADRUPED:TAIL:2EYES:2EARS:NOSE:2LUNGS:HEART:GUTS:ORGANS:THROAT:NECK:SPINE:BRAIN:SKULL:4TOES_FQ:4TOES_RQ:MOUTH:GENERIC_TEETH_WITH_LARGE_EYE_TEETH:RIBCAGE]
[BODYGLOSS:PAW]
[BODY_DETAIL_PLAN:STANDARD_MATERIALS]
[BODY_DETAIL_PLAN:STANDARD_TISSUES]
[BODY_DETAIL_PLAN:VERTEBRATE_TISSUE_LAYERS:SKIN:FAT:MUSCLE:BONE:CARTILAGE]
[BODY_DETAIL_PLAN:BODY_HAIR_TISSUE_LAYERS:HAIR]
[USE_MATERIAL_TEMPLATE:NAIL:NAIL_TEMPLATE]
[USE_TISSUE_TEMPLATE:NAIL:NAIL_TEMPLATE]
[TISSUE_LAYER:BY_CATEGORY:TOE:NAIL:FRONT]
[SELECT_TISSUE_LAYER:HEART:BY_CATEGORY:HEART]
[PLUS_TISSUE_LAYER:SKIN:BY_CATEGORY:THROAT]
[TL_MAJOR_ARTERIES]
[BODY_DETAIL_PLAN:STANDARD_HEAD_POSITIONS]
[BODY_DETAIL_PLAN:HUMANOID_RIBCAGE_POSITIONS]
[USE_MATERIAL_TEMPLATE:SINEW:SINEW_TEMPLATE]
[TENDONS:LOCAL_CREATURE_MAT:SINEW:200]
[LIGAMENTS:LOCAL_CREATURE_MAT:SINEW:200]
[HAS_NERVES]
[USE_MATERIAL_TEMPLATE:BLOOD:BLOOD_TEMPLATE]
[BLOOD:LOCAL_CREATURE_MAT:BLOOD:LIQUID]
[CREATURE_CLASS:GENERAL_POISON]
[USE_MATERIAL_TEMPLATE:PUS:PUS_TEMPLATE]
[PUS:LOCAL_CREATURE_MAT:PUS:LIQUID]
[BODY_SIZE:0:0:120000]
[BODY_APPEARANCE_MODIFIER:LENGTH:90:95:98:100:102:105:110]
[BODY_APPEARANCE_MODIFIER:HEIGHT:90:95:98:100:102:105:110]
[BODY_APPEARANCE_MODIFIER:BROADNESS:90:95:98:100:102:105:110]
[ATTACK:BITE:CHILD_BODYPART_GROUP:BY_CATEGORY:HEAD:BY_CATEGORY:TOOTH]
[ATTACK_SKILL:BITE]
[ATTACK_VERB:bite:bites]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PENETRATION_PERC:100]
[ATTACK_FLAG_EDGE]
[ATTACK_PRIORITY:MAIN]
[ATTACK_FLAG_CANLATCH]
[NOCTURNAL]
[HOMEOTHERM:10300]
[SWIMS_INNATE][SWIM_SPEED:2500]
[MUNDANE]
[SELECT_CASTE:ALL]
[PLUS_TL_GROUP:BY_CATEGORY:ALL:HAIR]
[TL_COLOR_MODIFIER:BLACK:1:GRAY:1:DARK_BROWN:1:]
[SET_TL_GROUP:BY_CATEGORY:ALL:SKIN]
[TL_COLOR_MODIFIER:BLACK:1]
[TLCM_NOUN:skin:SINGULAR]
[SET_TL_GROUP:BY_CATEGORY:EYE:EYE]
[TL_COLOR_MODIFIER:ORANGE:1:RED:1:CRIMSON:1]
[TLCM_NOUN:eyes:PLURAL]
Note: No testing has been done for now, and more demons will come. I am just a bit sick of the decidely non-terrifying giant feathered blue ticks, or towering hairy leechs with golden hair, or green scaly koalas.
How to add them in your game : Create a new folder in your raw/objects folder, named something like "creature_underworld". Paste the spoiler contents into it. Save. Generate a new world. Open HFS, possibly with the number of demons reduced to zero. Enjoy.