God dammit, lag sent me back to town after killing the chimera and while I did get to keep my loot, I didn't get to keep the stone or quest credit. At least I got a pretty ridiculous weapon out of it - S ranked poleaxe with 87-87 damage range. I've never seen anything with the minimum as high as the maximum. Shouldn't have any trouble soloing that boss next time.
But before that, I got sidequests to do. Seems like some of these are impossible in a group, but soloing is fun too. Especially since it's practically the only time I can actually use Parry.
Outside of the Labyrinth of Chaos you mean? Just in general, you can keep going? Not sure if I follow.
About how long until multiplayer is unlocked? I don't really intend on spending time in multiplayer, but if that unlocks other goodies I'm interested. Feel free to spoiler it.
After you beat a boss you can pick 'continue adventure' and it just throws you into a random level with your current party. You get various bonuses like extra gold or score bonus for continuing the 'chain', and between quests you can sometimes do a little cooking minigame to get extra temporary hp, damage, score etc.
The thing that sucks is if you pick continue and your party members don't, seems like they get replaced with AI. Also, you might get boned like I did and have a lag issue where you lose your quest progress.