Gorko The half fiend chieftain has been met. He has much distain for civilization. Phebus was captured near a old zone of madness. A war was fought there and the Tieflings fell. The iron spike came and ate Phebus years ago. But in doing so it left a small crack open from where it came to where the madness lies in Tureth.
With some work the Iron maw came forth and swallowed the spearpoint marauders. They went to the lake of fire. Phebus had a cell which he had killed himself in. Muad’dib had escaped from there. Phebus’s corpse had explained the Spiral towers. That they adapted themselves to be useful to each civilization so they would be protected even after their purpose had been forgotten.