Trade

Ethan glanced around cautiously. This wasn't his territory, and there was always the chance another zombie king might show up. It wasn't a good idea to linger here. He needed to head back and focus on researching the zombie evolution serum.

"Let's go. Time to head back and give you guys your shots."

"Shots?"

At the mention of the word, Bulldozer winced, instinctively rubbing his backside. He'd developed a psychological trauma from all the injections he'd endured.

Back at the tower.

Naturally, the task of administering the injections fell to the PhD zombie.

During the earlier battle, some of the elite zombies had sustained injuries—flesh torn open, black blood oozing out.

Since the X-virus had regenerative properties, Ethan decided to start with them. It was also a way to reward their contributions in battle.

The crate of X-virus contained a total of 500 doses.