He picked up a strange die that could enhance all kinds of ordinary items into fantasy objects. It could turn them into a Doran's Blade, a Stone Mask, a Philosopher's Stone, or even a Containment Object...
He thought it was going to be an urban-superpower story, but the next moment he transmigrated, and a horde of zombies came flooding in.
Ah, so it's an infinite transmigration story.
But then he used the all-purpose die to enhance something into a heavenly book that taught him the Dao, letting him cultivate and live forever.
Only then did he realize it was actually a cultivation progression story...
(Highschool of the Dead conquest in progress...)