From ErfWiki

[edit] Proposed Canon

First Appearance: TBFGK 40

A flying non-humanoid mount unit that is a fusion of pegasus, centaur and unicorn - a winged horse's body with a human torso in place where a horse's neck should be and a horned humanoid head.

[edit] Known Users

Jetstone (and through them, the Royal Crown Coalition)

Gobwin Knob (Uncroaked and Decrypted)