Aha, that would explain some of the cultural differences -- I thought maybe you were just American. I am from Earth, but there are a lot of differences even there. We definitely don't have tieflings, but we do have the Logos World, which is pretty close to what you're calling a different plane of existence. Space-time and all.

[He doesn't really know bags of holding, OK, he's not quite that strain of nerd. But he can kind of make a guess at it??? Hmm. Places where things slip through the cracks...]

I don't know if that's reassuring or not when it comes to our shadows, really.