Sword Poem is a one page RPG that has it's players create a terrible destructive weapon. You start by creating a wielder, describing how they found the Sword, and defining a number of principles they must follow.
Each round you roll 1d6 and eliminate that many of the principles and narrate how the Sword causes them to break or change them. You then add 1 new principle before starting over. The wielder dies when their last principle is removed.
The game doesn't have a set number of principles, but recommends 10, or a set number of wielders, so you can choose how many and how long you want the game to be.
I told the story of a dagger that was forged to kill a god but found it's way into other people's lives. I made 3 wielders each with 5 principles. You can read my game HERE