City of Sin - Book 2, Chapter 32

Upon awakening, Su Changkong found himself transmigrated to a world thrown into chaos by war and rampaged by demon monsters, where his martial arts talent was mediocre. However, Su Changkong discovered that as long as his own “life span” increased, his talents and potential could also be “limitlessly” enhanced!Cultivating the Health-preserving Fist technique and practicing the qi of longevity! The path to immortality is littered with corpses, and Su Changkong embarked on a Martial Arts path where he would not perish, even if heaven and earth were to be annihilated!

I transmigrated into the gacha game I abandoned for 10 years.But, the state of the heroes I raised is strange.

Are you humiliated by being attacked?

Are you sorrowful to be a stepping stone?

As a cannon fodder hanging in two episodes, are you unwilling?

Don’t worry, I am here!

As the only system supplier of All Heavens and Myriad Realms System Shop, I can make a variety of portable systems for you, and let you reach the peak of your life!

Boy, it’s time to raise your eyebrows!

Boy, it’s time to counter-attack!

- Description from Novelupdates

To save a doomed fantasy world, I killed the main characters, then destroyed the game world, and fell into another timeline as the academy's top seat and rival to the protagonist.Now, I'm trying to save the world and steer it towards a better ending…But I'm the final boss.