Blood sacrifice of millions of zombies, I am a demon cultivator in the end times

Zheng Yi traveled to the world of immortal cultivation, doing nothing, and became a casual cultivator at the bottom of the world of immortal cultivation.
Occasionally, he traveled to the doomsday world, where the blood moon was across the sky, zombies were rampant, and evil spirits were everywhere...
This place is simply a paradise for magic cultivators.
Killing zombies, refining evil spirits, devouring ghosts, eating corpse pills, and his cultivation level rose rapidly. Not only was there no heavenly punishment, but the cultivation speed was also very fast. How can you explain this?
Zheng Yi could only shout that this was unscientific.
Then he turned back to the world of immortal cultivation, sold the right to live in the immortal city, and went to the devil's domain overnight.
Soul-catching Sect, Corpse-raising Sect, Heavenly Demon Sect, Soul-eating Dao... Demon Sect, here I come.
Zheng Yi shouted, excitedly throwing himself into the arms of many notorious demon sects.
Soul-catching Banner, Soul-guiding Array, Black Evil Skill, Corpse-raising Skill... Zheng Yi threw himself into the enthusiasm of studying the magic method.
Others who practiced magic skills were either beaten to death by the righteous way, or were punished by heaven and killed by five thunders.
And I act on behalf of the heaven, practice magic skills, and have infinite merits.
One day, Zheng Yi deployed 330,000 soul-grabbing banners, commanded millions of evil ghosts, manipulated 100,000 celestial corpses, and surrounded the holy land of the righteous path with overwhelming demonic energy.
Both the righteous and the demonic masters were numb.
They shouted together, "Why didn't you, the demon, be killed by the heaven?"
"This is unscientific!"
...