I don't know about realms. We probably don't have those, unless you count game sessions. But you can travel between worlds normally, if you have the right ship. Trolls conquered many other planets. As for universes . . .

[She leans over and draws a circle in the dirt.]

Imagine that this is a universe consisting of many planets, or worlds. If you were outside that universe, you could access any point in space and time inside that universe.

[She then draws twelve circles in a ring around it, and, after a pause, another two for Prospit and Derse.]

That is where we were with regards to the universe we created. It was a place inside our game session, with its entire history within it.