My Survival System In An Apocalyptic World

Z-6 Crystal

What did it bring?

Watching the ant humbly place the giant crystal rock in his hand, Gray was both amused and curious.

Sadly, he knew very little about things like crystals.

But when his hands touched the Crystal, he heard the system's familiar ring echo in his ears.

Ding!

[It is detected that the host has come in contact with a rare Z-6 Pure Energy Crystal detected. Does the host wish to absorb its energy?]

"Hold on, system."

"Before that, what is this energy crystal and why is Z-6 rare?"

Gray felt he should know before absorbing it. But the more the system spoke, the more exaggerated his eyes began.

What?

A Z-6 crystal?

Gray's eyelids jumped in shock, almost dropping the clear crystal to the ground.

Don't you freaking understand how hard it was to touch anything higher than Z2?

Understand that within Z-Zone, the concentration of enethey here was so low that one can find zombies, plants, crystals and other objects within the ranks of Z-1 to Z-4.

Even professions are ranked i