So, I haven't played in some time, but I remember many things from this game.
One thing I have never seen posted anywhere but I have done is getting multiple Daedric Crescent's in a single playthrough.
When I did it, I had Chameleon at 100% and used the amulet to teleport. I killed him, but before teleporting back to Tel Fyr, I opened his body and took his weapon. When you get pulled from there, the amulet will be gone, and you will have an additional Daedric Crescent.
I hope this will work for someone else. I enjoyed it.

Yea, it's noted here : http://uesp.net/wiki/Morrowind:Magas_Volar , truthfully I only did this trick once, it was quite interesting since I have one I can use for battle and the other decoration.

After reading through that link, Id have to admit, Ive never tried that before. But to me, one Daedric Crescent is already strong enough, as well as all the other artifacts that are in Tel Fyr, so ive never done that