Capaill uisce (Water Horse)

Amphibious. The Capail uisce do not possess gills but they are able to hold their breath for 16 (2d8+3) minutes

Adhesive skin. Any melee attack or contact with the creature will cause the attacker to make a strength saving throw (DC 12) or else become grappled.

Weakness to iron. when the creature comes in contact with iron it deals 7 (2d6) fire damage and loses its reaction

Hooves. Natural Weapon Attack: +4 to hit, reach 10 ft., 1 target. Hit: 7 (2d6 + 2) bludgeoning damage. 

Bite. Melee Weapon Attack: +5 to hit, reach 5ft., one target. Hit: 6 (1d6+3)
piercing damage.

Body Slam. Melee Attack: +4 to hit, reach 10 ft., one target. Hit: 12(2d8 + 4)
bludgeoning damage. If the target is a medium or smaller creature, the target becomes grappled (escape DC 14).

Multiattack. Action. The Capall makes two attack with its hooves.

Charm. Action. The target must succeed on a DC 12 Wisdom saving throw or be charmed by the Capall for 1 round. Target must roll disadvantage if within 5ft. of a large water source

Undercurrent. Action. When in water, a Capall can create a dangerous undercurrent to push all targets within 5 ft of it away. Everyone who is affected has to succeed on a DC 11 Dexterity saving throw or take 9 (2d8+1) cold damage. 

Chase. If a target chooses to retreat, a Capall may choose to chase after as a reaction. Target must succeed on a (DC 10) DEX saving throw or take 10 (2d8+1) bludgeoning damage.