Board Thread:Lore Discussion/@comment-72.77.73.35-20140408131341/@comment-16644430-20140508160007

AngryEnclaveSoldier wrote: TheDreamweaver wrote: It's also almost impossible to kill a Daedric Prince outside's it's realm as it won't be fully out, just projecting it's power. No. It's possible to kill a Daedric Prince outside of its realm. It will be send to the Waters of Oblivion if that happens, where it is reborn. A Daedric Prince can only truly be killed if you kill it in its own realm.

That's essentially what I said. ALMOST impossible. By which I mean you'd need to be a being of cosmic power which traps the Daedra's spirit. Presumably no being has that much power as Akatosh banished Dagon rather than kill him, but I don't see why it wouldn't be possible if the Daedric Prince had fully entered the mortal plane.

The Daedric Princes are already able to walk the mortal plane as avatars from time to time, so I'd say there's a difference between that and when the barrier was down during the Oblivion Crisis.