Urnage's Island Rest

From publisher blurb: It is uncommon for a priest to pay fealty to two gods, but Father Urnage managed to straddle the line between the old gods and the new. When he went to his rest, he was interred with his relics, guarded by avatars of both gods. Can the PCs retreive the artifact from the guardians and other hazards that have come to protect the funeral cavern?