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Large giant, chaotic evil
Regeneration. The troll regains 10 hit points at the start of its turn. If the troll takes acid or fire damage, this trait doesn't function at the start of the troll's next turn. The troll dies only if it starts its turn with 0 hit points and doesn't regenerate.
Multiattack. The troll makes three attacks: one with its bite and two with its claws.
Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage.
Claws. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.
Born with horrific appetites, trolls eat anything they can catch and devour. They have no society to speak of, but they do serve as mercenaries to orcs, ogres, ettins, hags, and giants. As payment, trolls demand food and treasure. Trolls are difficult to control, however, doing as they please even when working with more powerful creatures.
Regeneration. Smashing a troll's bones and slashing through its rubbery hide only makes it angry. A troll's wounds close quickly. If the monster loses an arm, a leg, or even its head, those dismembered parts can sometimes act with a life of their own. A troll can even reattach severed body parts, untroubled by its momentary disability. Only acid and fire can arrest the regenerative properties of a troll's flesh. The trolls, enraged, will attack individuals making acid and fire attacks against them above all other prey.
Troll Freaks. Their regenerative capabilities make trolls especially susceptible to mutation. Although uncommon, such transformations can result from what the troll has done or what has been done to it. A decapitated troll might grow two heads from the stump of its neck, while a troll that eats a fey creature might gain one or more of that creature's traits.
Variant: Loathsome Limbs
Some trolls have the following trait.
If the troll finishes a short or long rest without reattaching a severed limb or head, the part regrows. At that point, the severed part dies. Until then, a severed part acts on the troll's initiative and has its own action and movement. A severed part has AC 13, 10 hit points, and the troll's Regeneration trait.