MTL - Unfathomable Doomsday - Chapter 135 Obedient young girl

Hou Niao, devoted to seeking the Dao, found himself mistakenly sent as an undercover agent to the Demon Sword Sect, eagerly anticipating the day he’d be rewarded for his service and could return to the Daoist Sect… Only when he had become a towering figure in the Sword Dao did he sorrowfully realize that there was no one left with the power to recall him!

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

TW: DARK ROMANCE FANTASY

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He was Chaos, the shattering soul that was deemed to wreak havoc and the cause of thousands of deaths.

Fear was a cloak that engulfed his existence.

He didn’t want anything except to find every piece of his damn soul, until the little white wolf entered his life. He wanted her.

Chaos didn’t care if he had to spill blood more than necessary, still he wanted her.

“You will put yourself in a battle against them,” He said begrudgingly. “Give up the girl.”

Yet, he stared into his eyes and he knew he wouldn’t be able to change his decision, as if it was already written on the stone.

“The girl stays. Touch her and I will show them what Chaos is.”

.....

Long Fei, a cross-timer and doujin, is an otaku who traveled to another world. In the original world, he was an otaku fan of Gundam and military science fiction.

He died in an accident and was reincarnated into another world. The Gundam works he had read before his death and the techniques in various military novels could be brought to another world.

How would he use the Gundam that Long Fei created? What waves can be caused in this different world?

- Description from novelbuddy