From the Sacrifice wikia:
Sacrifice’s campaign follows the story of a vagrant wizard known as Eldred. Five gods offer him a home, but Eldred must settle with only one. Early on in the campaign, the gods hear a prophecy that foretells their destruction by a traitor amongst them, a traitor that only a wanderer could defeat. As a result of this, their once harmless bickering transforms into all-out warfare, and Eldred must pick a side.