The Potion of Transmogrification, also known as the sex change potion, changes your character's sex. It is located in Fairfax Tomb in Fairfax Castle. It was created by Leo Head, a famous alchemist. The effects of this potion are irreversible as the game saves after use and it can not be taken out the room because it evaporates. If you don't drink the potion it will become a trophy named Sex Change Souvenir.