Mercedes Lackey 
The Mage Wars [EPUB ebook] 

Set around three thousand years before the rest of the Valdemar series, this is the ancient history of Velgarth and the story of Skandranon Rashkae, a gryphon with gleaming ebony feathers, keen magesight and acute intelligence. He is the fulfillment of all that the Mage of Silence, the human sorcerer called Urtho, intended to achieve when he created these magical beings to be his champions, the defenders of his realm.

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