A beast of chaos is a creature that has been warped when the demonic forces of the Abyss reach into the Material Plane. A beast of chaos vaguely resembles the animal it once was. Its skin and fur become leprous and patchy; its color fades to a dull sheen; its teeth become razor–sharp and more pronounced; its eyes turn to a bright golden yellow.
“Beast of Chaos” is an inherited or acquired template that can be added to any normal or dire animal (referred to hereafter as the base creature). It retains all the base creature’s statistics and special abilities except as noted here.
CR: Same as the base creature +2.
AC: Natural armor improves by +4. If the base creature does not have a natural armor bonus, it gains a +4 bonus.
Hit Dice: All current and future Hit Dice become d10s.
Special Attacks: A beast of chaos gains the two special attacks described below:
When a beast of chaos growls, roars, hisses, or makes any other sound common to its animal type, all creatures within 30 feet that hear it and those with fewer HD than the beast of chaos must succeed on a Will save (DC 10 + 1/2 the beast of chaos’ HD + the beast of chaos’ Charisma modifier) or become shaken for 5d6 rounds.
In the presence of bright light (a daylight spell, continual flame, but not actual sunlight), a beast of chaos flies into a berserk rage, attacking until either it or its opponent is dead. It gains +4 Strength and –4 AC while enraged. It cannot end its rage voluntarily. If the source of light is removed, the creature’s rage ends 1d4 rounds later. The beast is fatigued (–2 to Strength and Dexterity) for the remainder of the encounter.
Abilities: Str +2, Cha +4.
Organization: solitary, gang (2–5), or pack (6–11).
Beast of Chaos from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author Scott Greene.