en 1.8.8 /give Signs Awsome Trooooooooooollllllllllllllllllll!!!!!!Make sure they aren't in gamemode 1!How it works:Teleports players into "The Void". It will effect them with world border damage.
cobbleboots
cobbleboots
natemasterninja
iexplosiveking
mysticspyralman
cyarith