Sound a war horn to rally your forces, increasing you and your group's Maximum Magicka and Maximum Stamina by 10% for 30 seconds.
Name: War Horn Type: Ultimate ability Location: Alliance War > Assault Unlocks at: Assault rank 4
War Horn is a skill located in the Assault (which can be found in the Alliance War skill tree). War Horn is an ultimate. War Horn is a base skill, and can be morphed into Aggressive Horn or Sturdy Horn.