As you climb higher the air grows thiner and thiner. Suddenly there is a deep rumble like the ground itself is complaining about your presence. If the party  looks they will see only the remains of rock slides. As they continue the sound keeps coming. Eventually a rock castle Burst out of one of the rock slides. In Round 1 there are 2, But  2 more come toward the end of the combat. When they get the energy cores they will be able to do nothing with them except the person who will have a vision. The vision will be of 5 doors each with a slot for an energy core and the symbol of an axe on the door. The third door will be broken down with a coffin in the middle of a dome shaped room of stone. The coffin will be broken and a body wrapped in linen will be at the bottom. There is a place where an axe should rest between the body’s hands.