In the reaver raid there is a location where you can jump to and stand where you can jump and stand.
Once in this spot the reaver can some times hit you with his sword, but you dont have to deal with the eles so you can just lay down firewalls and drink heal pots till all 9 orbs are lite up and get fly drop a few nasty fire walls on the reaver and fly to the west lever and pull it and fly back and then do the puzzle.

Hope it helps