Couatl

So rare as to be considered almost legendary, the couatl is one of the most beautiful creatures in existence.

Winged, feathered serpents of considerable size and power, the couatl seeks to defend its territory against all invaders. Couatls are not malicious by nature, and frequently appoint themselves the guardians of humanoids within their domain, provided said humanoids are willing to offer it the occasional tribute.

For this reason, a couatl probably won't use it except to save a seriously wounded ally from imminent death, and in that case, it follows up with a sanctuary spell on its next turn, then spends the remainder of combat closely defending that ally.