My party circumvented Jzadirune by finding the secret door at the start and going directly down the elevator. They got incredibly lucky in taking out the stone spike and ogre. The npc with them then suggested that he was out of spells and that it might be a good idea to retreat. He also mentioned the possiblity of being trapped between the monsters in Jzadirune and Malachite. They went back to Jzadirune to clear it first before coming back.
Of course, there will be new surprises at the elevator when they return.
