The kelpie is a malevolent, shape-shifting freshwater fey that haunts lakes, rivers, and ponds. In its natural form, it appears as a dark, spectral horse, luring unsuspecting victims with its serene, hypnotic presence. This flesh-eating creature can shift into either a normal-appearing horse or human for two turns each day, using these forms to deceive and entrap prey.

The kelpie ensnares victims using its charm person ability, which it can use three times daily. Once it gains trust, the Kelpie reveals its true form, dragging victims into the water to drown them. Driven by an insatiable hunger and a love of cruelty, it relishes both the moment of death and the meal that follows, making it one of the most feared and loathed creatures of fey origin.