Get through the gate- Korrangar
They have extremely sensitive senses and will begin their attack faster than human opponents. Near the chasm there is a hole in the stone floor, make your way over there. You will emerge near the crane. Continue along the edge, and you will remain undetected. Then climb up onto the wall. Jump onto the crane again, when the elf below you will not be looking. Then use the rope to reach the vicinity of the balcony on the upper floor....