The Origin of Zombies

At the end of the 21st world, mankind entered the [relic era], and countless relics and ancient civilizations emerged one after another.

Ancient legends and ancient myths came into being.

In this era of cultivating truth, ancient martial arts, magic, and the ghouls and demons are everywhere.

At midnight, a zombie that cannot see the light.

How does it cross the celestial beings, achieve the origin of zombies, and move towards the top of the universe?