Talk with Lord Hades

You spend time talking with Lord Hades:

"So that book you're reading, what is it? Can't say I've heard of it before."

"Ah, that would be because it's not present in this world. Came from another realm."

"Really? How so?"

The two of you spend some time discussing other realms, and how Gaea is one planet among many in the realm the two of you presently are at.