Ourania

From GryphonWiki

Ourania (aka Ouri, Ourania Dreamchaser) is a black unisus with a rainbow mane, tail, horn, and wings.

Depending upon whether or not she's using the spine Sparhawk gave her, Ouri may or may not have rainbow spines useful in keeping other (more troublesome) Guilders off her back.

She is also known to have a battle form, with which she made a most dire and fell assault upon the megalithic golden dragon Aquanth.