Being Able to Edit Skills in Another World, I Gained OP Waifus - Chapter 10: The optimist chief priest and the pessimistic visitor.

A supreme expert in the Immortal World had died, and a strand of his soul returned to its original body on Earth. Tang Xiu discovered with amazement that ten thousand years passed in the Immortal World, yet only a single year passed on Earth.

Protagonist travels between different anime worlds to right wrongs and uncover his reason for being along the way.

- Description from Novelupdates

A boy wakes up with omnitrix as a X-GENE

Karnak, a human born as an illegitimate child in a fallen aristocratic family, rose to the transcendent rank and became the Death King. Even god couldn’t contend with him.However, after becoming transcendent, he missed his human emotions, such as satisfaction and other things.So, with his oldest friend and second-in-command, who shared his belief, he decided to return in time with Barros and start over.However, something seemed wrong with this timeline.Now is the beginning of the new adventure of the Death King Karnak.