"Sometimes, ya gotta fight fire with fire." It's an old saying that means in some situations, the only way to win is to take on aspects of one's opponent. In this case, it's the mother of all demons that's taken on the form of a Lilarch. To win, one of the Lightbringers must become a demon, themselves. That's what's going on in the new Massive Darkness scenario that CMON's posted over on their website.
From the website:
All is lost. Lynith, the mother of all Demons,has taken on the body of a Lilarch. There is no hope... Unless... One of us turn ourselves into a Demon too?
This is a special scenario for Massive Darkness! Are you ready to make the ultimate sacrifice?