In searching for the source of the poisoned waters, you found a strange bony hook and showed it to Fimreg.
'A tooth, perhaps? Or the hooked beak of some bird? Oh, if only it were so, ${PLAYER}. Imagine a half-dozen arms, lined with hundreds of these like teeth with which to grasp its prey, and a hungry maw that spits poison and breathes decay. I cannot speak of this monstrosity any more.
'Go to Rhúnelleth in Tármunn Súrsa. She will be able to tell you more of the wicked ways of Carn Dûm.
'Tármunn Súrsa is to the north-west of Gath Forthnír. Hurry, please!'
Tármunn Súrsa is north-west from Gath Forthnír, past the Gates of Carn Dûm.
Fimreg has asked you to speak with Rhúnelleth in Tármunn Súrsa.
Helchgam lurks in the waters of Carn Dûm, beyond the gates to the west of Himbar.
Rhúnelleth revealed the source of the poison to be a many-armed creature she called Helchgam.
Rhúnelleth is in Tármunn Súrsa to the east of Carn Dûm.
You travelled far into Carn Dûm and slew the dread beast known as Helchgam.