@Gilthwixt they've talked about it on the last pages, how they entered the Boss Room and Boss was already waiting for them, even though it was supposed to spawn after they entered. Which meant a previous party didn't kill the boss, and the previous party was that solo-guy.
Where did all the early chapters go?
I guess I should count myself lucky I've read a lot of this one before, as I normally ignore series with missing chapters as unreadable.
Seriously... something needs to be done about that shit.
@muser : Why would anyone want it licensed? That just makes it less accessible.