MTL - I Reincarnated During the Apocalypse and Killed My Enemies - Chapter 302 i won't let him die

This stands at the forefront of strategy guides to Life (a shitty video game)!

The world had been in chaos for over three hundred years.In the Central Plains, singing and dancing never ceased, foreign tribes sharpened their weapons and fed their horses, Sword Immortals roamed the Martial World, and famed generals quelled unrest in all directions.Five years before the great upheaval, the young Pharmacist Li Guanyi committed murder on a rainy night.At last, he opened his eyes and saw this chaotic human world.Underneath the hooves of horses lay piles of bleached bones – famed generals, beauties, the Martial World, Divine Weapons, commoners, Dharma Forms.Since ancient times, only white bones and yellow sand remained on the fields!Confucian Scholars, crushed beneath iron hooves; Buddhas, swept away by long spears!“I, Daoist Li Guanyi, invite this world to its death!”

Liu Fang, a manager, died suddenly at work due to being too diligent.
She thought that she would turn into a wisp of dust and dissipate after her death, but she never imagined that – the new century, the new underworld, even if she became a soul, she would still be a worker!

Liu Fang has become a newcomer to the underworld Quick transmigration Department. In order to wait for a good reincarnation, she strived to accumulate merit and traveled into one world after another to repair the way of heaven.

- Description from Novelupdates

I, a HIKKI-NEET, suddenly reincarnated in another world as a prince, and was immediately deemed the weakest ever, with my life already in a pinch after being abandoned as a baby, being stared down by a huge beast!?

However, I could only use one kind of magic. It was close, but I was able to avoid a “dead end” in my first few days of being born using that magic.

Anyways, I just want to live a lazy shut-in life as an adopted noble with my one all-purpose magic, but…?