WOW Gold and Arena pages have detailed information about the three main PvP systems in the game.

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or leaving their channels. By default they are both off; to join either type /join LocalDefense for messages in your current zone only

Local Defense Channel.This channel broadcasts messages when a friendly NPC in the zone is attacked. You can turn these "zone under attack" messages on or off by joining

For a more fundamental explanation of the PvP system, see our Realm Types page. The Honor System, World PvP, and Arena pages have detailed information about the three main PvP systems in the game.