Battlefield: Barrens is a world event introduced with Patch 5.3 in the Barrens of Kalimdor that presages the attempt to remove Garrosh Hellscream from leadership of the Horde. At the forefront of this effort is the Darkspear Rebellion. Unlocking the world event requires you to do several new scenarios and a quest chain showing the underlying politics behind your faction. Doing this, will award you with a special title: Hordebreaker or Darkspear Revolutionary