Itai no wa Iya nanode Bōgyo-Ryoku ni Kyokufuri Shitai to Omoimasu - Chapter 6

Aiden Nightshade was raised as an assassin since he was young and he had become known to the world and many feared him. This talent in assassination gave him the title of the Reaper, but his cause of death wasn’t something anyone could have expected...

But the universe brought him back to another world.

In this world, he discovered that people have different powers that he had never seen before, those who had them were called the Awakened.

To gain power, the awakened had to go to a place called the Otherworld, and clear trials that were given to them.

Using his experience as an assassin and using new skills which he couldn’t dream of before, he decided to become the strongest awakened in this new world.

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A world destroyed. An axe to grind. And a path to infinite power. Welcome to my reality.When the cultivators came to Earth, they destroyed our entire civilization in a matter of hours. Armies fell, cities burned, and that was before the moon turned red and filled our world with monsters.Now, over a decade later, what’s left of humanity slaves under the heels of our Qi-infused masters. The luckiest of us might even become one of them, they say—if we serve the Dynasty well enough and harness the power of Qi.But I want none of that.I’m sick of serving and I want nothing to do with their world. Instead, I want them to pay for what they did to mine. Maybe that’s why she found me. The fearsome, angry goddess who showed me a different path. Apparently, Qi is not the only route to power.Now I’ll fight to take back my planet, to grow strong enough to beat the cultivators at their own game. Through blood, sweat, and pain, I will free humanity or die trying.For that’s the Path of a Berserker.Path of the Berserker is a progression fantasy novel that contains immortal cultivators, an oppressive intergalactic dynasty, rage-inducing imperial bureaucracy, magical spirit beasts, fantastical martial arts and one pissed-off MC who’s sick of it all. Fans of western-style cultivation fantasy, post apocalypse, and xianxia will enjoy.

When he wakes up, Su Changkong has traveled to a world where troops are chaotic and demons are rampant, and his martial arts qualifications are mediocre, but Su Changkong found that as long as his [lifespan] increases, his talent and potential can be [infinitely] improved!

Wu Qin Xi: imitating tigers, deer, bears, apes, birds and other animals.

Turtle Breath True Dinggong: Imitation Qigong, like a thousand-year-old tortoise breathing, breathing, breathing and closing for a long time, prolonging life!

Celestial silkworm magic: nine transformations of the silkworm, breaking the cocoon into a butterfly, rejuvenating the old and rejuvenating, opening the door of life and death, every transformation is a rebirth!

Cultivation of health boxing, practice the Qi of longevity! There are many corpses on the road of longevity, and Su Changkong has embarked on a longevity martial arts where heaven and earth are destroyed but I am immortal!

- Description from novelbuddy

Perhaps it is the choice of fate. As a senior otaku, Qian Lingfeng got the “steel shell system”. However, when he swept the world with the system, became a local rich man, made all kinds of beautiful women, opened a harem, and realized the ultimate fantasy of thousands of otaku, he found that things seemed far from simple!
When the end comes, biochemical zombies suddenly come down, fierce beasts are in power, bloodthirsty zerg roam to kill the world, and human lives are comparable to dirt. Where will weak human beings go in this world? Is humanity going to be extinct? Or … can an otaku save the fate of the human race?

- Description from Novelupdates