Okay, so it seems like the beasts are getting their own update (thank God),
Anyway, even though this spoiler is kind of vague, I can see it fitting for shadow milk or mystic flour.
If this shadow milk, this would mean the story would probably focus on him, possibly showing how he got corrupted.
Assuming this is mystic flour, they are talking about. This would imply that beasts corrupted themselves due to their mistakes instead of Shadow Milk. One by one, they fall into their own despair. Which is pretty interesting.