Essentially. My world has... reflections. Due to an event long in the past, our world was sundered into our world, the Source, and thirteen other realities - reflections we call them - that are like our world but also different. Due to some very powerful influences, I was pulled onto one of these shards - the First.

[ He taps his chin with a thoughtful look. ]

There are other ways of bridging that gap as well. But nothing like this in my experience. And I am used to dealing with powers that threaten to destroy the world...