It would be level tree under the castile. you have tha one evevated plateform that I beleive has something to do with it I tried leaping but I keep coming up short.
I understand the is a benifite to getting up there.
Bah. I thought I had an end game save so I'd go take a look, but apparently my saves have vanished in the time since I played.
Sorry, I don't know the answer, and I don't have time to play through it again and figure it out. :(