EzioAuditore_1
Author can't he get a few authorities from canon campiones or nasuverse, specially from gods who are already dead in dxd using his lpsuch as nuada's ripping arm of silver, surtr's loptr laegjarn, and balor's mystic eye. Actually he can get Minos's labyrinth authority and get the authority of Beelzebub's Plague locust. This deities are already dead in dxd or neither deities at all (beelzebub).