Osiris is the Egyptian god of the underworld, and the one who authorizes resurrection spells.
Behind the Scenes
The Egyptian god Osiris was killed by his brother Set and sealed in a coffin. He was resurrected by his wife Isis for a short time so they could procreate. He was then resurrected as the god of the dead. The cult of Osiris was especially interested in mortality. These traits make Osiris a popular god in vampire fiction.