Devil May Cry 3: Dante's Awakening
As Dante catches up to Arkham, Arkham takes the Force Edge. He takes the form of Sparda and then turns into a large blob monster. In the middle of the fight, Vergil joins Dante to defeat Arkham and they both take him out the demon world. After Arkham falls back into the human world, Mary disowns her own name and kills her own father. From then on, she would call herself Lady. This was the nickname Dante would give her because she refused to tell him her name.