It's kinda hard to explain? Apparently we're supposed to believe that someone casted a spell that brought us all here only the person who casted the spell is supposedly dead.
And the face doubles are a thing here. There are people here that look like my brother but are not my brother. I also have like 5 different versions of my older brother here, one of which is a vampire and another that is younger than me.
Seriously, it's just easier if you just roll with it.