I thought they killed the blood emperor, but it was just an unnamed Muncheon wretch.
It's pretty interesting how those allied forces seem to possess no strategy to speak of. They are randomply getting slaughtered by the Muncheon powerhouses because they don't seem to know where they are and how to coordinate their approach toward the enemy. Once again I'm forced to wonder what even was the point of Woo-Moon gathering those people. They should have at least had a bloody strategy meeting before launching the operation.