Let's start from the foyer (the room with the 3 doors when you first enter the Mansion). Once you get the key to it, enter the middle door. Go up the hallway, and you'll see side rooms to your left and right every few feet. One of the side rooms to the RIGHT has a wall with a slight crack in it (it's a NORTH wall). Go up to the crack, face it and press enter. Coryool will knock it down. Enter and it's full of spiders! Explore and kill the spiders and you will find the key to the room behind the skeleton picture! yay!
