I encountered this place before, but was way under-powered for the final battle.
Now I'm ready to handle it, but I cannot find the dungeon!! The game gives no clue, even under the quest listing, it mentions the two people involved, but not the dungeon name... sadly, there are no walkthroughs online that even mention this quest...

can anyone give me a lead on this?

response received on Spiderweb forum:
"Circle Warrens are south of the Crone Caverns, where the old hags tried to imprison the party."