Creatures & Mutations

Deathclaws, super mutants, ghouls, and the FEV experiments and radiation that created them.

Abomination (Appalachian Mutation) — The Abomination is a monstrous, heavily mutated creature encountered in Appalachia, regarded as one of the region's most disturbing…
Alien — Zetans — colloquially known as 'aliens' — are an extraterrestrial species that has been visiting Earth for centuries prior to the Great…
Angler — Anglers are among the most cunning and specialized predators of the post-war swamps and coastal marshlands, indigenous to the Island…
Bloatfly — Bloatflies are grotesque, oversized mutated blowflies that infest the wasteland skies. Descended from pre-war Calliphoridae (blowfly)…
Bloodbug — Bloodbugs are mutated mosquitoes of terrifying proportions, with leg spans exceeding two feet and proboscises sharp enough to pierce…
Bloodworm — Bloodworms are mutated parasitic annelids endemic to the arid regions of the Mojave Wasteland, particularly prevalent in the Nuka-World…
Brahmin — Brahmin are the premier domesticated livestock animal of the post-apocalyptic wasteland — two-headed cattle descended from pre-war Bos…
Cave Cricket — Cave crickets are mutated orthopterans indigenous to The Pitt — the irradiated ruins of Pittsburgh, Pennsylvania — and the surrounding…
Cazador — Cazadores — Spanish for 'hunters' — are perhaps the most feared insectoid predators in the Mojave Wasteland. These enormous mutated…
Centaur — Centaurs are among the most horrific products of the Forced Evolutionary Virus (FEV) — grotesque chimeras created when The Master's army,…
Centaur Assembly Process — Centaurs are horrific FEV chimeras created by the Master, assembled from multiple creatures into writhing, many-headed monstrosities.…
Chameleon Deathclaw — The chameleon deathclaw is a rare deathclaw variant capable of rendering itself nearly invisible. It is a terrifying ambush predator,…
Deathclaw: West Tek's Abandoned Apex Predator — Deathclaws are large, bipedal, genetically engineered reptilian predators created by the U.S. military before the Great War. They are…
Feral Ghoul — Feral ghouls represent the tragic endpoint of ghoul degeneration — humans who were exposed to massive radiation doses (or specific…
FEV Curling-13 (Enclave Variant) — FEV Curling-13 is a refined strain of the Forced Evolutionary Virus developed by the Enclave for its biological weapons program. It…
Fire Ant — Fire ants represent a specialized and considerably more dangerous mutation of the common giant ant, distinguished primarily by their…
Fire Breathers (Radiation Resistance) — The Fire Breathers were an elite unit of the Responders in Appalachia, trained to operate in the most extreme irradiated environments.…
Flatwoods Monster — The Flatwoods Monster is one of Appalachia's most enigmatic post-war entities, named after the 1952 'Braxton County Monster' incident near…
Floater — Floaters are horrific FEV-created organisms that exist in a biological niche somewhere between creature and autonomous organ. Originating…
Floaters (FEV Origins) — Floaters are grotesque FEV creations that hover and writhe through the wastes, composed of fused organic matter with a single glaring eye.…
Fog Crawler — Fog crawlers are enormous mutated crustacean-arthropod hybrids that stalk the radioactive fog of Mount Desert Island, Maine. Standing…
Fog Crawler (Enraged) — Fog crawlers are enormous mutated crustacean-arthropod hybrids that stalk the radioactive fog of Mount Desert Island off the Maine coast.…
Forced Evolutionary Virus (FEV) — The Forced Evolutionary Virus, or FEV, is a genetically engineered retrovirus developed pre-war by West Tek as a bioweapon. It forcibly…
Gatorclaw — Gatorclaws are horrifying genetic hybrids — a fusion of American alligator (Alligator mississippiensis) and deathclaw genetic material —…
Gecko — Geckos are mutated reptiles common to the Southwestern wastelands, particularly the Mojave Desert and New California regions. Descended…
Ghoulification — Ghoulification is the radiation-induced mutation that turns humans into ghouls: long-lived, radiation-resistant beings with decaying…
Giant Ant — Giant ants are mutated formicidae that have grown to the size of large dogs, with some queen specimens exceeding the mass of a human…
Giant Hermit Crab (Mirelurk Hunter) — Mirelurk Hunters represent a distinct and particularly aggressive caste within the broader mirelurk species complex. Unlike the crab-like…
Giant Mantis — Giant mantises are mutated descendants of praying mantises, transformed by radiation into human-sized predatory insects. Standing four to…
Glowing One — The Glowing One represents an extreme stage of feral ghoul mutation — a creature that has absorbed such immense quantities of ambient…
Grafton Monster — The Grafton Monster is a massive, headless-seeming humanoid cryptid that stalks the region around Grafton, West Virginia, in the…
Grafton Monster (Alpha) — The Alpha Grafton Monster is an exceptionally large and aggressive specimen of the Grafton Monster species, typically encountered as a…
Gulper — Gulpers are massive mutated salamander-like amphibians endemic to the fog-shrouded Island (Mount Desert Island, Maine) off the New England…
Hairy Deathclaw Mutation — Hairy deathclaws are a variant of the standard deathclaw covered in thick fur, observed in the wastelands of the West Coast. The fur is…
Hermit Crab — Hermit crabs are a remarkable example of adaptive post-war evolution — mutated descendants of the common marine hermit crab (superfamily…
Honey Beast — Honey beasts are mutated insectoid creatures that represent a disturbing fusion of bee and bear characteristics, found primarily in the…
Lakelurk — Lakelurks are a species of mutated aquatic predators found primarily in the Mojave Wasteland's waterways, notably around Lake Mead and the…
Mega Sloth — Mega sloths are massive mutated descendants of the common three-toed sloth (Bradypus species), transformed by radiation and possibly FEV…
Mirelurk — Mirelurks are among the most distinctive and widely distributed mutated creatures of the post-war American coastline and waterways.…
Mirelurk Deep King — The Mirelurk Deep King is an exceptionally rare and powerful variant of the Mirelurk King, found only in the deepest aquatic environments…
Mirelurk King — Mirelurk Kings represent a dramatic biological divergence from the crustacean base of standard mirelurks. Unlike their crab-like…
Mirelurk Queen — The Mirelurk Queen is the apex of mirelurk evolution — a gargantuan matriarch that can reach heights of fifteen to twenty feet when fully…
Mirelurk Spawn — Mirelurk spawn represent the juvenile or 'hatchling' stage of the mirelurk life cycle — small, pale crustaceans typically measuring eight…
Mole Rat — Mole rats are mutated rodents descended from the common naked mole-rat (Heterocephalus glaber) that have proliferated across the post-war…
Mongrel — Mongrels — also referred to as wild dogs or feral canines — are mutated descendants of domestic dogs (Canis familiaris) that survived the…
Mothman — The Mothman is perhaps the most famous cryptid of pre-war American folklore, associated with the Point Pleasant, West Virginia area and…
Mutant Hound — Mutant hounds are grotesque canines found in close association with Super Mutants, particularly in the Commonwealth region. Unlike…
Night Stalker — Night stalkers are among the most disturbing creatures in the Mojave Wasteland — a hybrid species created at the Big MT research facility…
Nightkin — Nightkin are a distinct and tragic subset of Super Mutants, distinguished by their blue-gray skin pigmentation, their extensive use of…
Nightkin Schizophrenia (Stealth Boy Psychosis) — Nightkin are super mutants who overuse Stealth Boys, and their constant exposure leads to severe schizophrenia and psychosis. The…
Psykers (Psychic Mutations) — Psykers are rare individuals with psychic abilities, including foresight, telepathy, and mind reading. These abilities are a poorly…
Rad-rat — Rad-rats are mutated rodents found primarily in the Capitol Wasteland and the Commonwealth regions, representing a smaller but still…
Radroach — Radroaches are among the most common and recognizable mutated creatures of the post-apocalyptic wasteland, descended from the common…
Radscorpion — Radscorpions are among the most feared invertebrate predators of the wasteland — mutated descendants of the North American emperor…
Radstag — Radstags are mutated descendants of the white-tailed deer (Odocoileus virginianus) that roam the Commonwealth and surrounding regions.…
Scorchbeast — The Scorchbeast is the apex predator of the Appalachian wasteland — a gargantuan mutated bat of truly terrifying proportions. With…
Scorched — The Scorched are not a creature species in the traditional sense but rather a condition — humans, ghouls, and even animals that have been…
Scorched Plague — The Scorched Plague is a devastating infection that transforms humans into the Scorched, mind-controlled husks serving the Scorchbeasts of…
Sheepsquatch — The Sheepsquatch is a bizarre and terrifying cryptid of the Appalachian wasteland — a creature that appears to be a grotesque fusion of…
Snallygaster — The Snallygaster is one of the most bizarre cryptid-type creatures of the Appalachian wasteland — a horrifying fusion of reptilian,…
Spore Carrier — Spore carriers are among the most insidious post-war threats — creatures that blur the line between animal and fungus, predator and…
Spore Carrier Infection Cycle — Spore Carriers are humans infected by a virulent fungal spore that overtakes their bodies and minds. The infection is endemic to The Mire…
Spore Plant — Spore plants are semi-mobile, carnivorous botanical organisms found primarily in the Mojave Wasteland, with related species documented in…
Stingwing — Stingwings are mutated aerial predators resembling oversized scorpionflies (order Mecoptera), indigenous to the Commonwealth and…
Super Mutant Creation Process — The super mutant creation process transforms humans into powerful, mutated giants through exposure to FEV. The process has been performed…
The Cloud (Sierra Madre) — The Cloud is a deadly, corrosive red gas that fills the Sierra Madre resort, making the treasure of the casino a lethal prize. It is a…
The New Plague (Pre-War) — The New Plague was a mysterious and deadly disease that swept parts of pre-war America, contributing to the era's anxiety and the…
Trog — Trogs are degenerate, troglodytic humanoids indigenous to The Pitt — the irradiated industrial ruins of Pittsburgh, Pennsylvania. Unlike…
Trog Transformation (The Pitt) — Trog transformation is the final stage of the Troglodyte Degeneration Contagion in The Pitt, turning humans into blind, feral mutants. It…
Troglodyte Degeneration Contagion (TDC) — The Troglodyte Degeneration Contagion, or TDC, is a disease that transforms humans into trogs: blind, clawed, aggressive mutants. It is…
Tunneler — Tunnelers are subterranean predators that emerged in the Divide — the shattered canyon region connecting the Mojave to the California…
Tunnelers (Genetic Origin Theories) — Tunnelers are pale, fast, burrowing creatures native to the Divide, the storm-wracked region of the Mojave. They are a new, rapidly…
Virgil's Serum (FEV Cure) — Virgil's Serum is a compound developed by Dr. Brian Virgil, a former Institute scientist, to reverse his own FEV mutation. It represents…
Wanamingo — Wanamingos are among the most alien-looking creatures in the post-war wasteland, and for good reason: they are believed to be either…
Wendigo — The Wendigo of post-war Appalachia is a horrifying fusion of Algonquian folklore and biological nightmare — a gaunt, elongated humanoid…
Wolf — Mutated wolves are descended from pre-war Canis lupus populations that survived the nuclear holocaust of 2077 and adapted to the…
Yao Guai — Yao guai — a name adapted by Chinese-American survivors from the Mandarin term for 'monster' or 'demon' — are mutated descendants of the…