I've gotten past the trick bridge and into the library. Where is the Lich? I've picked the lock on the Level 12 lock, but I can't get the door on the other side of the room to open. I've been all over the rest of the castle that I can get to, and the only things I can't do are get through the door in the library, the one directly behind the Great Hall, and the Vault. Can anyone help me?

Have you tried the four possible water exits you can reach when jumping off the bridge?