Board Thread:General Discussion/@comment-11276487-20130724230617/@comment-124.180.20.177-20130921003448

YOu probably could. If you defeat them on the mortal plain they will go back to their own realm of oblivion. There you can kill them, but only if they use their power to make themselves mortal( unlikely a daedric prince would give up their immortality), or they could give the mortal the power to defeat them(again, very unlikely).