Body Cultivation Hurts

The apocalypse happened.

Portals appeared.
Zombies attacked.
Everyone got sucked in.

~~~
Welcome to Initiation

Regrettably, I have been forced to bring you here against your will… The universe is at war.

Your fiction speaks of demigods, monsters, superheroes, warriors that defy all odds, and cultivators. If you can imagine it, my Divine Genetic Modification Program makes it possible. However, power is always achieved through progress. Not all at once. If you’ve dreamed of flying, you’ll soar throughout the heavens. Super strength? You’ll crush boulders with your bare hands. What you call magic, regardless of how your culture envisions it, will be at your fingertips. My only advice is to dream bigger. Your concept of power is severely inadequate.
~~~

Nathanial Kane had read it all before.
It said they had centuries. The demons arrived in ten years.
He’d been counted among the strongest. It had all been for nothing.
He’d witnessed Earth’s end.

While dying, Nathan reviewed the only unique spell he’d ever found in the tower.
He cast Rebirth.