Found in Irithyll of the Boreal Valley in the Darkmoon Tomb, to the right of Gwyn's coffin. The area is concealed behind an illusory statue of Lord Gwyn. If the player has been following Anri's questline, the access to the tomb will be already open.
Swaps the player's animation set to that of the opposite gender. This effect is merely cosmetic and has no impact on gameplay.