ya nocturnals loot was crazy unbalanced...love it tho...anyway...you can be the leader of guilds and still be kicked out(why i dont know)...or u can just never do the quest in the first place and take umbra for your own personal use...but if u want to get all the daedric quests done (once u do them all a final one come available which gives u a nice lil book which i wont talk about here) youll have to make that choice with clavicus...i kept the sword and its been a pain in the ass since...but who cares, i got a badass sword
...i just hope the daedras games dont get worse than minor nuisances