It is one of the wells from which all of Creation flows.

[She's still irritated, and it shows, but she is explaining at least.]

You could spend centuries studying the ways that Pillars interact with the rest of reality and still have no idea where to start. Creation chooses its champions, and not the other way around.

[She gestures vaguely.]

Metaphorically speaking, though, it is very much like a pillar... in that if it crumbles, it may allow for the entire roof to fall down.