Board Thread:General Discussion/@comment-4698889-20170224092621/@comment-4698889-20170302203454

On a minor note, it would seem that Levia's let go of her grudge against Held after spending her time as Elluka - it's implied that Levia was once close with Held, to the point that she remembered him as an "old friend" after losing her memories.

As for Seth, it could be one of those "I hate you but we have to work together for the common good" scenarios, just like in SCaP where the demons were forced to follow Sickle's plan.