Apocalypse: Stack Damage by Slaying Zombies

In the apocalypse, all I want is to survive!

He can breathe fire, and he can fly.

I don't have any flashy abilities like that!

I can only stack damage infinitely!

Kill a zombie with my fists, and my fist damage increases by one.

Kill a zombie with a gun, and my gun damage increases by one.

Kill a zombie with a kitchen knife, and my kitchen knife damage increases by one.

What? Your ability is to turn into Iron Man?

I went out of my way to boost the damage of spitting. Let's see if one spit from me can kill you!

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.