Paragon of Destruction - Chapter 180 Blood Crisis

There was a turtle here,He was a bandit! A robber! A shameless scoundrel!Don't mess with him!

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

Winged beasts with a hundred-meter wingspan swooped from the skies above.Bloodthirsty creatures weaved and leapt between skyscrapers, in search of prey.Thunderous beasts shrouded in lightning took steps that shook the earth with each stride.Humans hid, trembling in the city ruins, praying for the protection of the World Tree.Outside the city, a gargantuan tree that eclipsed the sun, opened its eyes.“This is the city under my sanctuary. Leave, or meet your death!”In an instant, all beasts submitted.PS: Mutated Animals + Lord genre!Early-stage main storyline: Tame Mutated Animals and establish power.In the mid to late stages, the protagonist can transform into a human.

Su Yun was a prodigy, blessed by the gods. However, life is never so easy. Soon after reaching 6th stage in spirit novice realm cultivation, his progress stagnated due to incurring a rare medical condition.