"Rim" very vaguely rang a metaphysical bell--something about the structure of the universe--and Aila struggled to remember the details.

"Tamriel is on Nirn, not in Aetherius proper, if that's what you mean." She suspected they weren't having quite the same conversation, but damned if she could figure out the problem. "Are you a spirit? This is the mortal realm...I think."

She couldn't rule out a plane of Oblivion and daedric trickery, of course, but they didn't usually keep their realms so...uneventful.