Know Your 18th Dynasty Priestly Ancient Egyptian

A tomb, a fire-throwing gun-toting Veela, her world-weary warlock paramour and the inferi-like mummy of an 18th Dynasty Priest, possessed by the selfsame priest's spirit. Or why having a wedding ceremony performed at elephant gun-point in an obscure clerical form of an extinct language by a malevolant revenant ghost possessing the corpse of a Pharaoh's court official is a bad idea.