I have a bit of question. I'm not a total expert or anything, so please correct me if I get anything wrong.
So, Nightmare is obviously the leader of The Bad Sans and all. Supposably, they destroy AU's and whatnot.
My concern is mainly wrapped around the fact that new AU's are constantly being created. If their goal is to eliminate every single one, it'd be nearly if not completely imposable. Not just because more and more are being created, but also because of AU's that generally can't die. (Or at least can't die to physical attacks) like Ink for instance. He technically can't die until all AU's are gone, right? And all AU's won't ever die out completely leaving him basically immortal, right?