Lord of the Sky City - Chapter 19 - 18: Great Crisis

The world’s worst offense, is called Love.

«Grey, elemental affinity, zero» The Elder announced the result loudly.

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

Mason was a mercenary, until the day he died on a mission after being betrayed by his unit.