Better late than never, right?
Nemiel managed to one-shot kill the demon prince and the group lived to fight another session. Somehow, despite a surprising number of botches around the table, we made it to the end of the session with only minor mental trauma - and a dead NPC, which Orlandis took very hard because they were friends.
Meanwhile on the Arkadius, the ship was being shot at from the ground and had to go into hiding behind a moon. Oh, and a small group of Tyranids are coming our way. Fun!