One of Xuuvosic's minions is an encyclopedia. So you guys actually know where the Mucklestones are. I don't think you know exactly which one is the correct portal, though, but I'd have to look back at the thread to remember for sure. Bah, he got high enough that he is pretty sure he knows which one is the correct portal. So yeah, you guys know where to go next, assuming you're going to the underdark portal.