Amphibious. The capaill uisce can breathe air and water.
Change Appearance. The capaill uisce can use its action to polymorph into a Medium humanoid it has seen, or back into its true form. Its statistics, other than its size, are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies. Otherwise, a creature must take an action to visually inspect the illusion and succeed on a DC 15 Intelligence (Investigation) check to discern that the kelpie is disguised.
Sticky Skin. The capaill uisce adheres to anything that touches it. A Huge or smaller creature adhered to the capaill uisce is also grappled by it (escape DC 13). Until this grapple ends, the creature is restrained, and the capaill uisce can't constrict another target. Ability checks made to escape this grapple have disadvantage.
Grappler. The capaill uisce has advantage on attack rolls against any creature grappled by it.
Hooves. Melee Weapon Attack: +4,{"diceNotation":"1d20+4","rollType"."to hit","rollAction":"Hooves"} to hit, reach 5 ft., one target. Hit: 6 (1d8 +4) bludgeoning damage.
Ram. Melee Weapon Attack: +4,{"diceNotation":"1d20+4","rollType"."to hit","rollAction":"Hooves"} to hit, reach 5 ft., one target. Hit: 6 (1d6 +4) bludgeoning damage.
Fey Charm. The capaill uisce targets one humanoid or beast that it can see within 30 feet of it. If the target can see the capaill uisce, it must succeed on a DC 15 Wisdom saving throw or be magically charmed. The charmed creature regards the capaill uisce as desirable and must make every attempt to approach the capaill uisce. Although the target isn't under the capaill uisce's control, it takes the capaill uisce's requests or actions in the most favorable way it can.
Description
--"He watched the wheeling eddies boil,
Till from their foam his dazzled eyes
Beheld the River Demon rise"--
The capaill uisce is a shape-shifting spirit, whose true form is a massive, writing, sea horse. It thrives in the damp and the deep, and can usually be found in caves or near large bodies of water.
These creatures are carnivorous, with a naturally adhesive hide of briny water weeds and moss, tarry black eyes, and needle sharp teeth. Because of their fey heritage, this true form is seldom seen, as have the ability to transform themselves into other creatures. Capaill uisce tend to take the form of a black stallion or a beautiful little white pony. They can also appear as beautiful humanoid figures, in which guise they may betray themselves by the presence of water weeds in their hair. Both of these forms hide their true purpose, which is to lure and consume humanoid flesh. If they are mounted, the capaill uisce will run off and drown its riders.
The capaill uisce has a weak spot, however; its bridle. It's said who can get hold of a capaill uisce’s bridle will have command over it and any other capaill uisce, though such artifacts are rare and their true powers are mostly unknown.
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