We learn that some hundred years ago (Fray POV) one great slayer (probably Buffy) together with her allies faced an enormous apocalypse and won. The result was that all demons - and all magic - was banished from our dimension. What with Buffy happened, we don't know yet.

Hmmm, interesting. I wonder if it means that the battle in Chosen wasn't *the* apocalypse (because in season 8 demons still exist). Or it means that Frayverse exists in an alternate dimension.