Get the Wizard. When you Activate The lifts Zurana will jump down. When Zurana's head is in the place you are in, use the valve. Zurana will walk back and get trapped under rocks. Use the lifts to get to the top. When you defeat the skeleton pick up the staff switch to it and head for the exit. Zurana will try to blow you away. Keep shooting the same place for ages and eventually a copy of Zurana will appear. Keep slashing Zurana with it's claws and he will die.