User blog comment:GamerNerd i/Power Corrupts: Stephany, Aftermath Witness/@comment-26988423-20180703121114/@comment-26593304-20180703143936

The purple isn't actually referring to Zombies. They're... Something else Vergel made up. You'd have to ask him.

I think it was something about Plant/Zombie hybrids but that doesn't sound right. I abandoned the RP pretty early so I don't really know how it evolved.