Frill horses are actually not horses, but an unusual equine species native to the plains of the Southern Continent. Frill horses have a membranous frill instead of mane, and a long, frilled tail. Male frill horses have horns and spikes on their back legs.
Frill horses are herd animals and can be very protective of each other. This makes them excellent mounts for war. As simple riding mounts, frill horses can be difficult to control.