Traveling through Dragon Ball, Gu Xuan unexpectedly encountered a system that gave him a combat power of 100 billion at the start, and he could evolve infinitely.

From then on, no one in the heavens could defeat him.

Sun Wukong: I used to always look for fights, until I met Gu Xuan...

Thanos: I don’t like people touching my head either, but I can’t beat Gu Xuan.

Bruce Wayne: I'd rather have a hundred clowns in Gotham than see Goshen again.