Memories of the heroes, perhaps? Thaum vaguely remember something about them having been active in this area, but cannot really put his finger on it.

"I see. Climbing this far up, and more importantly, back down again would be quite challenging. You can reside inside me, if you would like, though my essence is shifted towards Undine, so I do not know if this would cause you discomfort in some fashion." So far, there has been little in the way of answers in regards to what effects Thaum's peculiar state may have.