I would Shout in every zone:
"This is your God! You have all sinned...you have to be purified with pain! Let the reign of darkness begin!!!"
Then spawn 3 HNM in every zone, with the Wyrms spawned in the cities, and AV and KB, and the Jailers in Whitegate...besiege that bitches. I'd turn everyone on PvP. I'd set the Home point timer to 3 seconds, and disable all mog house entrances. I'd ban anyone who tried to log out, and prevent everyone's char from disconnecting server side. I'd reset all things up on the AH to 1 gil. Then after 30 minutes...I'd despawn all HNM, set prices of all non sold items back to their original value, allow disconnects of anyone not connected client side. The bans would stick....wusses runnin and shit.
Yeah...basically reign of chaos.