I'll go Dawnguard side, I can get the Soul Cairn summons anyway, and there's no downside effects. Like a said, Serana is a pretty good follower in my opinion, and on Dawnguard, I can still get her, right?
I'll go Dawnguard side, I can get the Soul Cairn summons anyway, and there's no downside effects. Like a said, Serana is a pretty good follower in my opinion, and on Dawnguard, I can still get her, right?