Marvel: I'm a Symbiote - Chapter 26 Tragedy

A story about a traveler who crossed into a parallel universe, relying on his Proficiency ability to continuously grind experience and become stronger.

A river song, triggered a legend of the rivers and lakes.
Tian Zun’s life motto: “My sword is the truth.”
Shen Lang’s life motto: “To serve people with morality, those who are dissatisfied are dead.”

- Description from uukanshu (translated)

Fu Qian gracefully removed his skull, as if a gentleman were taking off his hat to pay respects.…Everything began with a transcended-dimension invitation.It’s a story of a high-quality Thug turning the impossible into the possible.Of course, on that day, the great being behind the invitation was still unaware of what it had done.

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