[The idea of a single being in multiple places at once is not alien to him, but he might as well try to describe what the colour yellow looks like to someone who's never seen it for all the good language serves him in this. There is no easy explanation, no singular answer.]

Demons also come from those portals. And those portals - rifts - are opening due to the actions of a diseased husk with delusions of godhood called Corypheus. The organization that found you is at war with him.

[He inclines his head to the glowing sliver of green in her palm]

That shard means that you too are a part of this fight.