DON'T FINISH THE GAME.
I just finished Shadow of Mordor, got a Nemesis I was happy with, but now I realize that Nemesis Forge doesn't include that Nemesis if they're dead. If you keep on playing, you'll have to kill that Nemesis as part of the story, and they won't appear in Nemesis Forge. So now I have to go into the Nemesis Forge open world and f**k around aimlessly until I arbitrarily pick a new Nemesis, rather than carrying over my personal rivalry that grew naturally throughout the course of the game.
Kind of tempted to just replay the game closer to launch and then stop just before the ending, rather than force a replacement.
Edit: And apparently, Uruks won't cheat death in Nemesis Forge. This mode is baffling to me. Not even going to try, I'll just get a new Nemesis the right way.
Edit: The Plan: Redux: Uruk Resurrection.
So, since the Nemesis Forge is the worst possible way to forge a Nemesis, and since I can finish the game without losing to an Uruk, I'm replaying with no upgrades, Intel is only being used on Warchiefs and Revenge targets, while Wraith vision is only being used while standing still. So, mark objectives in the UI, confirm if Captains are around, but don't don't identify the Captains. Just knowing that one of these Uruk I'm scoping out could be the Captain is enough. Taken out the first two Warchiefs in the first area so far, and I'm actually struggling a little bit. Haven't been killed yet, but I have been chased off by some pretty good Nemesis candidates. One of them was even mistaken for a random Uruk at first, so imagine my surprise when he just grabs me in the middle of what should have been a routine kill. And since I don't have the execution ability, the Captains I've actually managed to kill are never a guarantee, so some of them have even come back during missions to complicate them.
I haven't had this much fun with SoM since my first playthrough. I'd recommend anyone wanting to prep for SoW who doesn't already have a Nemesis they're happy with (and the time to invest in a replay, of course) to try this.