http://tvtropes.org/pmwiki/pmwiki.php/Main/EvilIsHammy

I usually save the dremora lords for the big nasties, like draugr deathlords... though recently I encountered one deathlord that literally one-hit-killed my dremora...

Most important to me though is an avenue for mages to get their hands on daedric gear.

Once you hit 90, go talk to http://www.uesp.net/wiki/Skyrim:Phinis_Gestor at the College of Winterhold, and once you get a spherical item through that line, go down into the Midden with an ebony item, a black soul gem, a dwemer centurian dynamo core, and a daedra heart.