Cavern Troll

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

Regeneration. The cavern troll regains 10 hit points at the start of its turn. If the cavern troll takes acid or thunder damage, this trait doesn't function at the start of the cavern troll's next turn. The cavern troll dies only if it starts its turn with 0 hit points and doesn't regenerate.

Rocky Camouflage. The cavern troll has advantage on Dexterity (Stealth) checks made to hide in rocky terrain.

Sunlight Petrification. If the cavern troll is exposed to natural sunlight, it can move or take an action, but not both, nor can it use bonus actions. The cave troll must make a DC 15 Constitution saving throw at the end of each of its turns, turning to stone on a failed save. A greater restoration spell or similar magic restores the petrified cavern troll. Spells like sunburst and other effects that create powerful natural sunlight do not petrify the cavern troll, though it does become stunned until the end of its next turn after being exposed to such an effect.

Multiattack. The cavern troll makes one Bite attack and two Claw attacks.

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 9 (1d8 + 5) piercing damage.

Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) slashing damage.