Fantasy World: The Eternal First Zombie

In every era, from the Primordial Age to antiquity and the medieval era, mighty experts ruled heaven and earth and endured across all the worlds. Yet even the undying, indestructible Zombie Ancestor fell. The moment a lowly creature became a zombie, the secrets of the ages were unlocked, and everything that came with them was revealed. The heavens and earth are vast: if you refuse to accept it, then fight!