River 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.

Amphibious. The river troll can breathe air and water.

Horrific Appearance. Any humanoid that starts its turn within 30 feet of the river troll and must make a DC 11 Wisdom saving throw. On a failed save, the creature is frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, with disadvantage if the river troll is within line of sight, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the hag's Horrific Appearance for the next 24 hours.

Unless the target is surprised or the revelation of the river troll is sudden, the target can avert its eyes and avoid making the initial saving throw. Until the start of its next turn, a creature that averts its eyes has disadvantage on attack rolls against the hag.

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.

Crushing Hug. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 28 (6d6 + 4) bludgeoning damage, and the target is grappled (escape DC 15) if it is a Large or smaller creature. Until the grapple ends, the target takes 28 (6d6 + 4) bludgeoning damage at the start of each of the river troll’s turns. The river troll can’t make attacks while grappling a creature in this way.