OK, so you have your saber.
Did you notice the mechanism that opened the doors on one side of the courtyard before you got your saber? Figure there are two sets of doors, neither one opens 'normally', they use an ancient automated system, which you must manually cause to happen ... maybe with some recently aquired item and power? (don't want to spoil it too much!)
You are so close to done ... just about opening the next whole chapter of a great game ...
Dopelar effect (n.) The tendency of stupid ideas to seem smarter when they come at you rapidly.