This cave is located at the foot of the mountains north of Tyrn Lhuig. Judging by the steam rising from the pools of water inside, it would be wise to assume this to be a damp and humid cave. It is from here that a band of Gorthorog, lead by the brutish Ulkrank, make their home. The trolls seem to keep flame-worms as pets inside as well.
Entering the cave requires having the quest Ancient Lair.
-  Instance: Ancient Lair - Fellowship
-  Ancient Lair - Fellowship
These creatures are encountered inside this location:
- Fonn, one of the Hillmen of the Trév Gallorg, sent a scout to an ancient cave in Malenhad, the brimstone swamp, where many Gertheryg were observed gathering. The scout, Bethan, never returned, and Fonn fears he may have been taken by the trolls. — Instance text
The 1st chamber upon entering Ologfil
Tunnel to Ulkrank's throne
Worms lounging about the steam pools