If you're going to rip off Minecraft, do it right. This is just a bad version of Classic MP, and honestly, it fails to get any of MC's fun. There are less block types, there's NOTHING that Beta has, and loads of other stuff I'm not going to mention because I don't want to waste time. As I said before, if you're going to rip off a game, do it RIGHT.
Zandera. If you max zombies, they can hordekill anyone that comes their way and if the upkeep limit hasn't been hit, the horde only gets more powerful. Pretty much anything maxed out is viciously lethal.