An ending that makes sense.
Cut the gods nonsense, just a good story, we solve whatever the problem is in a way that best fits our character.
Should probably deal with the aftermath, whatever that is, it's not really clear actually. Story should probably not be time sensitive so allowing for exploration, which I do anyway, but some people apparently don't like to keep big bad waiting. So far as I'm concerned big bag can take up a hobby until I'm good and ready to reach the end.
I'd start with a new character and retire the watcher, he's got a castle to rebuild apparently which could take a while.