Go inside. I can't remember the exact route, but I think the path takes anda round past a cliff and into the blood tower atau the blood room atau something along those lines.
You'll need to go through the doors on the sides into a large room. I think there are doors on the side of the room leading up to the selanjutnya level. Repeat this.
wen u get half way up the main tower there is a door that needs a key go in the door that sais planes of oblivion then walk over 2 the tower go 2 the puncak, atas get the key then leave that tower and go back 2 the main tower and unlock the door then walk up 2 the signil stone ok