The Misfit of Demon King Academy (WN) - Chapter 14.1

Ruins stretched across the landscape in the apocalypse after the nuclear war.

Wang Ming stood at the pinnacle of existence—just a step away from transcending Heaven and Earth, poised to ascend to a realm no one had ever touched. But at that moment of glory, he was schemed by none other than the Heaven’s favored one—the Son of Luck's master.Forced into regression, Wang Ming is thrown back to his younger years, but this time, so is his greatest enemy. With fate itself seemingly against him, and the Son of Luck determined to end his rise before it begins, Wang Ming must walk a blood-soaked path once more.But he is no ordinary cultivator, he is a variable who defies destiny. Against the will of Heaven, against fate, against the Chosen… he will rise again.This is the story of a man who refuses to bow to fate.

In the era of universal mechas, people can go to the endless abyss, collect materials, strengthen and forge their own mechas, and master the power of destroying the world.

Jiang Chen traveled through time and awakened his talent [Immortal Unarmed]. Once the mecha is broken, he can permanently absorb its power and receive multiple bonuses.

…

At the bottom of the abyss, when the Old Demon God finally broke the Titan mecha with great effort, a hand stretched out from the fragments and held down its head.

“Congratulations, you have unlocked my limiter.”

- Description from novelbuddy