Before becoming addicted to the PF servers I played on a server that had zombie hell "I think that was the name" Basically unlimited ammo and the Zombies had AI. You had to kill hundreds each round and every round they had more hp and different zombies would spawn. I believe they had around 26 levels and it took team work to beat the boss's. The humans got to choose speed/jump/and something else as an option. I think the clan who use to have that server is called DG. I know the clan is around but the server is no longer running. I would love to play on a zombie mod like this again.