Sarah went to her bag pulled out a bright red thumbdrive, plugging it into one of the data ports available, with her tablet she gained access and brought up a sort of schematic of the spire.
"This is speculative, I've never been close enough to the Spire to actually know if this is true, but..." On the screen was the Isengard they knew, or a very simple shape of it, with stairs on the inside, a blank room at the top, and an invisible shield (shown by dotted lines) around it. And the blank earth around it. "What we should do, is see if there's an Oubliette, or part of the sewer system, that runs underneath. I doubt there is but it would be worth looking into."