Detective Conan: Death Note - Chapter 10: Nice to Meet You… Is It Okay If I Call You Ran-chan?

Violet skies, a world undergoing massive changes, a deficient moon, interlinking voids…
When the world experienced a cataclysmic event,the majority of living things ceased to exist. Although humanity survived by hiding in the last safe zones, humans had to face mutated dire beasts and colossal source beasts that could break through the space barrier and enter the earth at any second.
Luo Yunyang, a young man who grew up in those calamitous times, obtained an attribute regulator and set out to walk the path of supremacy!

- Description from novelupdates

Found a suitable body named Bai Xiao. Reincarnating into the World of Elementalists.

“Mission: Overpopulation of carnivorous fish in the lagoon.

Please kill 666 carnivorous fish in order to prevent the destruction of the lagoon’s ecosystem.

Reward: 20 Balance Points.”

“Mission: Forest fire.

Extinguish the fire.

Reward: 200 Balance Points.”

- Description from Novelupdates

Ghost stories descend, binding national fate.People enhance themselves and their nation's luck by constantly participating in Analog Horror.Mental patient Jiang Xiao is initially selected to enter a nine-star level mental hospital Analog Horror!However, he bizarrely finds out that he seems to be the most seriously ill one...Jiang Xiao: “I sign a pact with the ghost stories, the weirdness is my grandson!”Participating in the seven-star level Analog Horror “Where Did Daddy Die”.A peachy-cheeked son with big eyes blinking asks: “Do you want to be my daddy?”The chosen one: “Yes!”Son: “Then I have a tiny request, which is to beat you to death!”One chosen daddy after another is smashed into pulp by the son right from the start.Facing the rebellious son charging forward, Jiang Xiao smiles coldly: “Dad, I'm actually your son!”

This novel is also known as Don't Mess with the Dark Princess

When trash becomes a genius—one word: Fierce! Two words: Two-faced! Three words: Too heaven defying!

She is the foremost and outstanding armament refining master. Passing through a dynasty, and became a publicly humiliated and bullied Third Young Miss. Ancient beasts, too outrageous? Obediently become a docile pet, or I’ll make you into soup!

Ninth rank talent, rare talent in a thousand years? She was born with a godly constitution, crushing all geniuses!

Peak level Profound Grade Armament, beyond priceless? Sorry to embarrass, but the bowl she uses to feed the cat is already at the God Grade….. she possessed a pair of eyes that could see through everything, yet she couldn’t see through—him!

Merely exposing his demonic smile, Prince Mou lightly loosened his belt: “Can’t see through? Do not fret, you can slowly view when you return to the room. I’ll allow you to scrupulously inspect from head to toe.”

- Description from Novelupdates