Dark Fissure
From the OblivioWiki – your guide to everything Oblivion
Dark Fissure is a cave located southeast of Cheydinhal, and east of The Reed River. Inside the cave you will find various undead creatures (zombies, skeletons, lichs, etc.) and human necromancers, as well as your standard dungeon loot. For those of you interested in Black Soul Gems, it should be noted that the cave doesn't have any Black Soul Gems to loot (as was my experience after searching this cave in its entirety) although there may be a small chance to loot one from a necromancer.
Outside of the cave is a Necromancer Altar which is used to create Black Soul Gems. Once a week a light beams down on the altar, usually on Loredas.
When you are first doing the Quest: Necromancer's Moon, you are able to grab a Black Soul Gem from the Altar when the Necromancer makes it.
[edit] Quests
- The Mages Guild quest: Necromancer's Moon
