Kelpie

Very similar to a Nix. Appears as a horse, if anyone tries to ride it they immediatly drag the rider to the nearest body of water to drown and eat them, leaving only the liver.

How to kill it:
?

Other Information
A Nix can be made to apprear by dripping your blood into water or sacrificing a black animal by drowning it in the water.

A kelpie can be safely ridden as long as it cannot see water.

Also putting a bridle on the Kelpie makes it obey the person.