Esior

Esior is a Bird from an unknown plane, and a Mage's familiar.

Esior is the ideal familiar. Need to get somewhere? Esior will fly you there. Trying to cast a spell? Esior will help channel your magic. Looking to confide in someone? Esior is a great listener. Indeed, any wizard would be thrilled to head into battle with Esior by their side. But if you wish to borrow her strength, there is something you must understand: to Esior, you're her familiar.