We will be moving to MobArena instead of ZArena.
Due to a lack of updates on ZArena preventing us from moving to the latest versions of Minecraft, we have decided to go with MobArena instead. MobArena, although more complex to configure, appears to have faster updates and more support for newer versions of Minecraft. Our arenas will remain the same and we will do our best to mimic the game play within the new configuration. This change will happen over the next couple weeks. MobArena is already live and can be reached by using /ma rather than the /za command.