War Troll

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.

Multiattack. The troll makes three attacks: one with its bite and two with its greatsword. It can use Cleaving Swing in place of one of its greatsword attacks, if available.

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 8 (1d6 + 5) piercing damage.

Greatsword. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 19 (4d6 + 5) slashing damage.

Cleaving Swing (Recharges 5-6). The troll swings its greatsword, and each creature within 10 feet of it must succeed on a DC 18 Dexterity saving throw. The target takes 19 (4d6 + 5) slashing damage on a failed save, or half as much damage on a successful one.