Act Four opens with a soliloquy by the Duke of Guise. He tells the audience that he has finally resolved the matter concerning the resurrection medicine. He says that he heard that the demon was once a friend of the Duke's. Five years ago, on the full moon, Guise was on his way to bring his aunt and xooya to the capital, but he had to return to Guise's palace at the last minute because of an incident with the witch's ship. Guise says that after the incident, he saw the "most incredible side" of his son. He compares him to a "mountain of demon corpses" and says that his son is the "strongest exorcistor" of