I shared quite a few info on Steam post.
You continue where you left off at B1. The rest, as I said, is a giant wall of text I left there.
This is false. Or rather, misunderstanding on your part. No, hell no. Book 2 doesn't mean Elleria 2. Elleria 2 is whole game for itself, Book 1 is continuation of Elleria 1 and where Book 1 of Elleria 1 wraps up.
There is far too much content and story to say.. "Hey, this ends here." Impossible.
And yes. Elleria 1 though, ought to have some DLCs. One of them, where you play as different MC, aka Silas Varros that is presented in CH4. Though you play as him nonetheless in B2 on multiple occasions.