Keen Smell. The troll has advantage on Wisdom (Perception) checks that rely on smell.

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.

Magic Resistance. The golem has advantage on saving throws against spells and other magical effects.

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.

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.

Troll Vomit (Recharge 5-6). The Troll spews forth vomit in a 30-foot cone. Each creature in that area must make a DC 14 Dexterity saving throw, taking 7 (2d6) acid and 14 (4d6) bludgeoning damage on a failed save, or half as much damage on a successful one. Any creature that fails its save must make a DC 14 Constitution saving throw or be poisoned for 1 minute.