Global Demon Transformation.

Refine demonic spirits, and soar through the skies and burrow underground!
In modern cities, spiritual energy is revived, and humanity is no longer the master of civilization.
Back then, the sky was devoid of sunlight, covered by birds of prey; the ground was stained crimson with blood; and humanity became nothing more than stray dogs and food—a true hell on earth. It wasn't until a martial artist with a wildly imaginative mind merged the demonic spirits of dead beasts into his dantian that humanity was spared annihilation.
By refining demonic spirits, one gains the ability of demonic beasts to fly and burrow underground. A person who was originally dead returns to the age of eighteen because of a demonic beast.
That day happened to be the annual awakening day of the demon spirits.
That day, he refined an evil spirit.
Evil spirits, malevolent and ominous beings!

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