Patch 5.4.0 or Patch 5.4 or the Siege of Orgrimmar was the fourth patch of the fifth expansion in Mists of Pandaria. In it, players defeat Garrosh and his "True Horde", and Thrall makes Vol'jin the new Warchief. This is the first time the Horde is led by a non-orc Warchief.

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