The cursed Shadowfang Keep in Silverpine Forest is the only place to get the materials you'll need. Travel there and obtain Lord Walden's talisman, the Book of Lost Souls, and essence from the ghosts haunting the keep.
You will also receive:
Did you bring the materials I'll need for your weapon?
Ah, you must be <name>. Terga said that you were venturing to Shadowfang Keep to find the materials needed for this weapon and I see that you have not disappointed. I will make you a mighty weapon worthy of what you have brought.
- Patch 9.0.1 (2020-10-13): Name changed from Terga's Task, quest giver changed from Terga Earthbreaker.
- Patch 5.4.0 (2013-09-10): Name changed from Dreamseeker's Task, quest giver changed from Kardris Dreamseeker.
- Patch 4.0.3a (2010-11-23): Added.