spoilerish I suppose so I'll go ahead and tag it...
After the Duergar "ambush" by the lake for the first time I actually noticed that one of the "shattered Duergar" corpses is willing to talk so I used speak with dead and one of the questions was about valuables. The corpse indicated that the gnomes were fiddling with some rubble. I didn't see anything revealed nor do I find any rubble around that can be interacted with. Has anyone figured out what this means for is it just something Larian hasn't included yet?
well just get on the boat in the Underdark, youu\ will find out.