The Extra's Survival: Logging into the Game Master System! - Chapter 42: [End of the World!]

Qin Tian accidentally transmigrated into a sickly body, a body with broken Dantian that was unable to practice Qigong, in another world. Fortunately, God had mercy on him by giving him a level up system. Useless? That was him in the past. Not worrying about practicing Qigong, he was now able to kill Monsters to level up. Easy! Level up when killing Monsters; level up when killing people. An unbeatable sovereign of the clan in the eyes of other people, but in his eyes, he is a glittering big BOSS.

With this level up system, he will no longer encounter any bottlenecks during a breakthrough in cultivation like other geniuses; all he needs to do was kill as many monsters, clan heads, sovereigns, world experts … to have a better life.

Dedicating his life on a road to become an expert.

- Description from Novelupdates

Lu Yuan was originally just a normal ordinary person, but one day he passed through it and became a day of destruction with a splendid reputation in the DC universe.

Doomsday does not refer to a single monster, but a terrifying legion from the technological civilization of Krypton.

But Doomsday is not a superman. In fact, it is a terrible biochemical weapon invented by the dead body of Kryptonian who got superhuman power and resurrected.

Lu Yuan became one of the doomsdays after just passing through, and entered the core of the sun for 100,000 years.

One day, Lu Yuan woke up, but when he flew back to Earth, he found that this place is no longer the Earth of the DC universe. I don’t know why he seems to have come to Marvel?

“Isn’t this invincible? Without kryptonite, I would be God.”

- Description from novelbuddy

At first, when he learned that he was forced to go to many different routine worlds and be reborn into all kinds of cannon fodder, he was against it.

A soul was employed by a higher being to help him manage his world. How will our protagonist live her life to the fullest while also fulfilling her new duties?I don't own Naruto. I adjusted the story to my liking. English is not my main language so don't bother about grammar mistakes too much.