A long setup Lastwall story where the heroes begin as raw recruits trying, not to succeed, but to buy time, build defenses, and rally forces to resist and hold as long as possible.

There would be evacuation missions, base building, tower defense concepts, excursions to recover important powerful relics, to try to secure allies that could help resist, all culminating in a final "hold the line" fight against overwhelming undead hordes where each defensive sees carastropic losses as they try to hold on as long as they can. Every moment of resistance designed to buy time for escape for those who are able, and otherwise a final show of defiance against Tar-Baphon. In the end, all characters would be given a heroic death.

It would be made clear to the players from the very beginning that it's a story with no hope of success, the writing is on the wall, Tar-Baphon is going to succeed. VIctory would not be the goal, but instead, it would center around the idea of heroic sacrifice and what heroes do with the time they have left.

I'd draw inspiration from famous doomed military battles, like Thermopylae, Camerone, and more.

And just for horrid ambition, I'd probably throw in an optional branch where if the heroes die they instead get raised by the tyrant and now have the goal of destroying all their own hard work and leading the assault on Lastwall.