I get a very strong feeling that Roswaal is part of or working for the Witch's Cult. He clearly had an ulterior motive back in S1 (he mentions it), but it's not clear exactly why he wants to kill the dragon. We still don't really understand the nature of the dragon either, but I think this season will tell us. Anyways, back to Roswaal being aligned with the Witch's Cult. First, when he saves Rem/Ram, he "happens" to be there when the Witch's Cult attacked their village. It's most likely he was there as part of the attack and took the two because he thought they'd be useful for his plans. His sponsoring of Emilia seems to be a furthering of the Witch's Cult goals since he knows it will put a bulls-eye on her, but he doesn't seem to be overly concerned with keeping her safe. Second, the fact that Beatrice seems intimately familiar with the people within the Cult highlights the connection. It's also possible that Petelgeuse was corrupted in some way and they were originally allies in fighting Satella. Then it would suggest we have the Witch's Cult faction aligned with Satella and perhaps another faction of other witches trying to stop her. It feels like one way or another, he's trying to have Emilia take on the role of one of the Witch's or at least use her as a pawn in some way. Since the workings of the world aren't clear to us yet (i.e. role of dragon, witches, spirits, etc in how the world works), I'm a bit conflicted on exactly where Roswaal sits in all this, but I do feel like he's in bed with them. This Sanctuary then is going to have a strong correlation to the "Witch" faction, but I guess it's unclear to me which one. Then of course I got to the end of the episode and it kind of got highlighted that I'm on the right track. I'm trying to find the episode in season 1 where Ram explains some backstory on Satella, but can't right now. Anyways, fun times! Super pumped for this season!