The Necromancers are the minds behind the zombie hordes. They created the zombie plague and are directing it from the shadows. This particular group of zombies seems extra rowdy. We'll have to get to that Necromancer quick if we want to survive. That's what's going on in the new Zombicide: Green Horde scenario that CMON has posted on their website.
From the post:
We need to elliminate the Necromancer summoning all these troops. But never was the horde so rowdy! They seem to just multiply... We wonder if that's the Necromancer's work.
A scenario for Zombicide: Green Horde. Enjoy!