From ErfWiki

Proposed Canon

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

Speculation

Unipegaturs can be used as a mount, at least when uncroaked.^[1][2][3]

Known Users

Royal Crown Coalition - but may be an independent faction in their own right like Marbits or Elves.