I... really just don't know what to have Prussia do in endgame. It's like there's nothing he can do that can't be done better by someone else, or I'm drawing a blank.
I doubt the escape to the hidden floor is all of endgame. There will probably be things to do after. Or maybe even one of the higher floors will have a thing he can do.
Okedoke. I'll probably just wait and watch then.
/also stuck in the "well I guess he's just here if you need him" trap.
^ this