» Sat Feb 19, 2011 3:24 am
Aaaaanyway back on topic
http://www.uesp.net/wiki/Lore:Ancestors_and_the_Dunmer seems to indicate the Telvanni are indeed necromancers but don't practice on other Dunmer.
edit: Perhaps this is why they owned so many slaves? The ones on Vvardenfell didn't appear to own much farm land, and the slaves didn't appear to be doing any sort of labor. Maybe the Telvanni simply fed off their souls.