Amphibious. The water horse can breathe air or water.
Magic Resistance. The water horse has advantage on saving throws against spells and other magical effects.
Hooves. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 2d4+3 piercing damage.
Offspring of a kelpie and a horse are impossible to drown, and can be recognized by their shorter than normal ears.
They share some of the strength and intelligence of their Kelpie Parent and are strong riders but less challenging to tame.