You are a Reaper. Once you were a hero of the world, but then you learned the terrible truth: this world is rotting away, and only by putting it out of its misery can a new one be born.
Reaper's Edge is a rules-lite roleplaying game based off of 2400 by Jason Tocci, This project is still in development, though for an experienced Game Master there is enough content that you should be able to easily run a few sessions of it.
Development is going to continue to provide more spells and artifacts, a small bestiary describing some of the world's inhabitants, various tables and resources to make the setting your own, and additional play advice. The goal is to retain the single sheet of rules, but to have enough resources to easily run a full campaign (between 6 and 12 sessions).