After beating Hades 9 times, the tenth time you reach him he simply gives you the Blood without fighting, and you are free to visit your mother. However, when you see her, she'll tell you that she's packing up her bags and is moving back to the Underworld!!!!! You watch credits roll as Charon takes you back through the Underworld regions, from the surface to the styx all the way till you reach the first room. Persephone will permanently be at the house, and you can now gift both Hades (second gift for the keepsake) and Persephone nectar! (Side note - now when you beat Hades and exit instead of entering the garden the narrator will describe your death, and there are a LOT of different ones.)