I believe that the Dark Brotherhood are mislead in TES. Sithis/Padomay has nothing to do with them, he's too vast and void-like. Rather the Night Mother is just the daedra Mephala pretending to give his orders. It fits especially as the Dark Brotherhood formed as an offshoot of the Morag Tong when they stopped worshipping Mephala.
Zen Toombs said:Why would death negate an oat.... wait! [/looks up the words of the nights watch oath] Okay, there's no "till death do us part" line in the oath, and as far as I can tell there is no mystical benefit or components to membership in the Nights Watch, so only people and yourself would care if you broke it. Even if in the minds of some people dying relieves you of previous oaths if you come back to life, most people in Westros wouldn't believe that Snow HAD died and come back to life. If he doesn't continue to follow his oath, he would receive the same response from most people regardless of his death/life status. Namely, if they care and they find out, they will try to execute him.
TL;DR The oath isn't magical, only people care if you break it.
Night gathers, and now my watch begins. It shall not end until my death. I shall take no wife, hold no lands, father no children. I shall wear no crowns and win no glory. I shall live and die at my post. I am the sword in the darkness. I am the watcher on the walls. I am the shield that guards the realms of men. I pledge my life and honor to the Night's Watch, for this night and all the nights to come
So the first bit I highlighted could be an argument for it being absolved by death, the second part is ambiguous and the last bit could go against it (depends if the mean ALL the nights as in the rest of time, or just all the night that a new nightswatchman would have in his future).
Now I don't think Jon Snow is going to get back up and give the Watch the finger as he swans off to become King. But if he did want to I think it's enough of a legal anomaly for him to get away with it. Jon was savvy enough to point out that they defend the realms of men, that wildlings are human and they should therefore help them
So the first bit I highlighted could be an argument for it being absolved by death, the second part is ambiguous and the last bit could go against it (depends if the mean ALL the nights as in the rest of time, or just all the night that a new nightswatchman would have in his future).
Now I don't think Jon Snow is going to get back up and give the Watch the finger as he swans off to become King. But if he did want to I think it's enough of a legal anomaly for him to get away with it. Jon was savvy enough to point out that they defend the realms of men, that wildlings are human and they should therefore help them