In the long past, before the world became a game. There existed a planet that housed one of the strongest races in the universe. Undying and undefeatable, the only thing that was cursed to this race of godly beings was their age. Because no matter what they did they would die at the age of 117.
A race that could rival gods could never actually stand up to them due to their short lifespan. While beings lower than them pursued a path to immortality, living longer than them and getting stronger as a result.
This race of beings remained in a constant state of rebirth and death, like a comet, they peaked fast and died off as well.
None of the remedies that looked for worked, they searched the whole explorable part of the galaxy, destroyed entire planets, and even tried to make pacts with gods, but none of it worked. And before long, a certain part of this group of people got tired of the carnage.