Solve the chain puzzle in the chamber with suits of armor
This is not the only problem, though, because there are two suits of armor here. One of them is armed with a spear, whereas the other one wields magic. In here, there is a chain that ids connected with the puzzle here. It may be a bit troublesome to figure out what to do, so take the following steps. Grab on to the chain, by holding down Circle button (do not climb up the chain!...