User blog comment:Metadwarfosis/In anticipation of volume 11- Dwarven Kingdom and Expectations/@comment-212.57.215.90-20160623233502/@comment-28167000-20160707160504

The undergroud cave are not the troll cave, because it wasn't underground. In volume 8 they say:

The mandrakes arranged themselves into a formation while shouting ‘Long live Ainz Ooal Gown! Long live Ainz Ooal Gown!’ in unison.

“They’re not too smart. It’s a shame, considering that their cousins Galgenmaennlein, Alruna and Alraune are pretty intelligent… We didn’t spot any of them in that forest. Maybe it’s simply too big and that’s why we haven’t ran into any yet. '''There was a pretty sizeable underground cave at the mountain range. It seems like there’s a myconid tribe in there. We haven’t touched them yet.”'''

I don't think the CDL are in the underground cave as LonElyNeko previously said. I think we are gonna meet some myconid tribe there.