I Fused with a Chaos Physique and Became Invincible

Across the fantasy heavens, myriad races vie for supremacy. Some open the heavens with double pupils, some shatter stars with a flick of their fingers, and some sever the ages with a single sword... Tang Chen’s soul entered another world sixty years ago, but he was unable to cultivate. He could only resign himself to living as an ordinary rich second-generation heir, marrying and raising children.

Unexpectedly, sixty years later, the System awakened. Tang Chen fused with a Chaos Heavenly Body, overturning the heavens and the Myriad Worlds, stirring the river of time, and crushing every enemy across the nine heavens and ten lands.

(I’m not very good at writing introductions, so please move on to the main story.)

P.S. An invincible protagonist story. The protagonist is invincible from beginning to end.