I think it's good because it stops the people who camp on the elevator but it could use some balancing. As for poison zombies they're not much of a problem, they walk slow as fuck and slow down any other class whilst healing so it gives you a chance to run somewhere. And the power they are in mass groups is when they cooperate and use something called "teamwork" which zombies lack these days so all you have to do is run, if they all go poison zombies then it's pointless because then you have a chance to get far away from them. That's my opinion anyways, poison zombies havn't been much of a problem for me but there are a few features you could add to them I suppose: Make it so when they attack they slow down and don't cause poison gas damage. Make it so when they attack they no longer heal the group of zombies, but the downside is that they don't slow them down whilst attacking either. That's my two cents.