Blood sacrifice to millions of zombies, I will be a demon cultivator in the apocalypse

Introduction: Zheng Yi traveled from Blue Star to the world of immortality, but did nothing, lying at the bottom of the world of immortality and becoming a casual cultivator. Occasionally, I travel to a doomsday world, where there is a blood moon in the sky, zombies are rampant, and ghosts are everywhere... This place is simply a paradise for demon cultivators. Killing zombies, refining ghosts, eating ghost souls, eating corpse pills, and your cultivation level is slowly rising. Not only is there no divine punishment, but your cultivation speed is also extremely fast. How can you explain this? Zheng Yi could only shout, this is unscientific. Then he turned around and returned to the world of cultivating immortals, sold his right to live in the immortal city, and went to the demonic realm overnight. Soul-catching sect,