After becoming joining the Mages Guild you eventually find out that Arch Mage Traven has outlawed Necromancy. Some in the Guild want to take it a step further. Some members of the Mages Council and their supporters have decided to take out the rest of the Necromancers in Cyrodil and have chosen you to do the job. This is not an epic quest but an on-going group of side quests to clean out all of the Necromancer lairs around the land. You will be rewarded for each robe you collect along with some appropriate Necromancer loot.
Even when the quest is "over" you can still turn in robes for cash when the lairs respawn, and then go back through the old quest list and do it all over again.
This is not meant to be an epic quest with new areas, etc. If you want one of those see my .sig. I highly recommend The Underdark Parts II and III or Heart of the Dead, Adense Dungeon, etc.
Ideas and comments are welcome.