Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 15 - 15-24. Trazayuya

A young boy named Chen Zong got lucky and found a mysterious Sword Seal. With the help of it, he rose to be a God in Sword who defeated innumerable top talents in all universes from a remote borderland.

- Description from Novelupdates

Seven billion humans living on the Earth time-traveled together after they had woken up one morning. They all heard a synthesized female voice.

The whole people cross the border of mountains and seas.

Start a thatched hut, build a house, farm, and raise exotic animals?

Su Mu, who was reborn, said, I just want to live in peace and quiet.

Every day, I take a thousand-year-old strange beast for a walk, and a ten-thousand-year-old giant beast for a walk.

Occasionally go fishing for a few mermaids and come back, the days are free and comfortable.

When I get bored, I kidnap a dragon girl and come back to play with it.

Hey, I’m just playing….!

- Description from novelbuddy

This is a bizarre and mysterious world filled with various sinister cultivation methods. Once a person begins to cultivate, they will either undergo mild changes in appearance and temperament, descend into madness, or become a great elixir for evil beings to consume...Duan Yun, having transmigrated into this world, unexpectedly comes across a supreme elixir cultivation manual, the 'True Explanation of the Jade Sword.'To his surprise, he is a one-in-a-million cultivation genius who, unwittingly, transforms the manual into something extraordinary. Guided by the Jade Sword, he is able to pierce through everything.Later, as his mastery over various methods grows, Duan Yun, carrying the philosophy of 'the enlightened benefit the world,' never keeps secrets and spreads martial arts across the land.Who would have thought...“Duan the Demon misled me! He said this technique enhances yin and yang, but now I can only squat to pee, boo hoo...”“It was the Demon who taught me this 'Seven Parts Returning Qi'. Instead of blessing me, it brought disaster—I either get killed or step in dung. The fortune-teller said I've lost seventy percent of my luck.”“Don't trust a word of what Demon Duan says! The fairy of the Myriad Wonders Palace was supposed to ascend the whole palace to the heavens, but in one night, she was possessed and turned into a demoness, all due to that old demon Duan's handiwork!”...Duan Yun finds this incomprehensible. All he did was practice martial arts, spread techniques, and occasionally emulate the laws of nature, so how did he become notorious as a demon?This is slander!The same techniques cause no issues for me, so the problem lies with you all, not me!