I'm not even entirely sure what a Zombie is anymore, in this worlds context. Is it a dead account sat by someone else, and then used to attack other players? If so, then that particular tactic is being used by every vaguely succesful tribe on pretty much every world currently running.
Please! There has been maybe a few hundreds posts about it. Zombies referred to accounts being played by the same few players via stolen/somehow acquired passwords, and NOT via sits - mass multiaccounting, if that sounds "better". Some, like LBM also adds the accounts which some Stormies were trying to hijack by logging in via password and trying to change the related email and pretending themselves to be the real owner towards both the admins and other members (both are against the rules).
Although I'm relatively baffled by the mergey/global/tribe thingey that seems to have happened.
The situation is a shame if you ask any western player, but apparently, you can only blame the staff for this purely bureocratic crap (they basicly refused to close the world without it even though you can't find a dozen players still enjoying to put money and time to a dead world like this).