I Shall Cuck Everyone - Chapter 16

There is a way in the world here, and the manifestation of the way is a Gu.

When people practice, they cultivate the energy of heaven and earth all over their body to drive away Gu insects and display supernatural powers.

Traveling through a year, Chen Qing finally discovered his specialness on the day he contracted the first Gu worm. He was able to see through everything about the Gu worm…

So, he started to fight steadily, step by step on the road to longevity.

- Description from novelbuddy

I was sixteen when the gods abandoned me.The Blessing Ritual was supposed to grant me power, a divine gift to carve my future. Instead, I received nothing. No abilities. No hope. Just another nameless soul left to rot in a world ruled by strength.Fine. If the gods wouldn’t bless me, I’d make my own power.For ten years, I clawed my way forward, experimenting with forces no human should touch. I pushed too far—and it killed me.Then I woke up.Sixteen again. Back at the Ritual. But this time, something changed.Time bends at my will. Blood moves when I command it.The gods still won’t acknowledge me, but it doesn’t matter. This world isn’t fair, and I’ve stopped playing by its rules. Faith and Chaos clash in my veins, and I will use them both.They wanted a Chosen Hero, someone to dance to their tune.Well, too bad for them—I’ll carve my own fate.

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

In a world where cruelty reigns and only the ruthless survive, Arthur—a boy born in the gutters of a city ruled by monsters—knows only one truth: power decides fate. Shackled by the past, driven by vengeance, and desperate to carve his own path, he plunges into a brutal struggle for dominance. But as blood stains his hands and the lines between man and beast blur, Arthur stumbles upon something far more dangerous than war—fragments of a life he was never meant to have. A name. A home. A reason to fight beyond survival.But is survival enough, or will he become the very thing he swore to destroy?