To unlock the Blue Army attribute, upgrade Lu Xianyue to reach LVL50. And you must have 5,500 officer suits to unlock Lu Xianyue's ultimate skill (Penetration). Activating the Penetration will reduce the defense of the hostile military units by a certain amount for a period of time. When you send your troops, a blue halo will surround them.
How to unlock the "blue army" attribute?
Last Updated: 506d