Mutant Bestiary

Table of Contents

1. Biological Rule
2. Universal Classes
3. Regional Adaptation
4. Naming Rule

Biological Rule

Mutant abilities must arise from distorted biology. Tissue deformation, fungal expansion, nerve hijacking, immune failure, repurposed glands, abnormal muscle growth, necrotic regeneration, and chemical heat exchange are valid explanations. Magic and unexplained elemental powers are not.

Cold, heat, acid, smoke, or light-like effects require a physical mechanism. A creature may absorb heat through endothermic enzymes or produce corrosive bile; it may not cast ice or fire.

Universal Classes

These classes are supporting canon for the setting. A class does not need to be named in dialogue every time a creature with the relevant anatomy appears.

Feral Howler

• Original host: feral cat.
• Anatomy: elongated bone structure, patchy fur, enlarged limbs, and hypersensitive whiskers.
• Behavior: shadow-stalking ambush predator; pounces and produces disorienting screeches when cornered.
• Regional change: coat and coloration vary, but its core behavior does not.

Husked Lurker

• Original host: human.
• Anatomy: partial decay, black spore veins, dislocated joints, fungal growth along the neck or spine.
• Behavior: wanders until disturbed; may manipulate doors or tools through retained muscle memory.
• Cognition: no meaningful human intelligence remains.

Emberfang Mutant

• Original host: wolf or other large canine.
• Anatomy: overgrown jaw, exposed musculature, luminous veins, and semi-mobile tendrils along the back and limbs.
• Behavior: retains pack instincts and uses flanking, feints, and entanglement.
• Death risk: damaged tendrils can leak spores.

The name does not establish literal fire.

Spitter-Class Mutant

• Original host: human or corvid-like bird.
• Anatomy: enlarged esophagus and cheek sacs containing corrosive digestive bile.
• Behavior: attacks from range and targets eyes and breathing.
• Effect: respiratory inflammation, chemical injury, and possible suffocation—not magical poison or elemental damage.

Grubspawn

• Original host: insect larva.
• Anatomy: a simple nervous system overtaken by spores.
• Behavior: swarms wounds and corpses to feed and propagate.
• Death risk: releases parasitic spores.
• Climate response: larger and more active in warmth, slow and shriveled in cold.

Rooting Spore Pod

• Original host: plant/fungus hybrid.
• Anatomy: immobile bulbous growth rooted into soil or flesh.
• Behavior: expands territory gradually and releases spores when disturbed or stepped on.
• Regional change: colour and spread rate vary by biome.

Cryospine Wretch

• Original host: mammal hybrid or failed clone.
• Anatomy: membrane spines and endothermic enzymes that pull heat from the immediate environment.
• Behavior: territorial; detects thermal signatures, slows prey through localized heat loss, and attacks with chilled barbs.
• Habitat: extreme cold; capable of semi-hibernation.
• Rule: its frost is heat extraction, not ice magic.

Tanglejaw Ravager

• Original host: bear-like mammal hybrid.
• Habitat: distorted forest edges and derelict industrial zones; avoids extreme cold.
• Behavior: charges the strongest visible target, grapples, intimidates with roars, and does not retreat.
• Combat identity: overwhelming mass and aggression rather than a supernatural effect.

Regional Adaptation

Climate may change size, insulation, colour, activity, metabolism, and propagation rate. It should not arbitrarily grant a new unrelated power. Distinct regional variants require an anatomical or ecological explanation.

Naming Rule

The class names above are the canonical reference terms. Long lists of alternate names in the raw development notes are reserved vocabulary, not simultaneous species.

Field slang such as “Twitchpelt,” “Flamevein Hound,” or “Sporewell” may be promoted when a scene establishes who uses the name and why. Avoid names that falsely imply literal combustion, magic, or intelligence the organism does not possess.