The kelpie is a supernatural water horse from that is believed to haunt rivers and lakes. The kelpie is an man-eating beast, and will lure humans to take a ride on its back. Once upon its back, the water horse will dive into the water and drown its rider, thus it is wise to keep away from them.

Kelpies are members of the Supernatural and Fantastic Wayfarers Association.

SOURCE(S): The Zork Chronicles