Those that bond with the Beast-God of the Moryena gnolls must undergo the mad trials of Grash'vor the Devourer, Khraz'khet the Hunter, and Nath, the cruelest judge. If they survive, PCs may call upon Zhy'Kyvash, the three-headed hyena god for aid and vengeance! 

This PDF contains specific information about using the patron bond spell and the details of the invoke patron spell for Zhy'Kyvash, the Beast-God.