A seemingly mundane an physical application of mana manipulation, Battle Aura seeks to provide a method for explosively improving physical power and defense. While it functions on manipulating the mana within the body, its use is more a function of instinct that grows with the physical training of one's body. As their body matures, they will innately come to understand how to wear their Battle Aura.
Battle Aura can be applied to specific body parts or the entire body for offensive and defensive techniques.
Offensive use of Battle Aura goes hand in hand with one of the three primary sword-fighting schools. Your Battle Aura will improve your physical prowess and if applied to your sword, allow you to strengthen it as well. A strengthened sword can slice through boulders in a single strike or unleash a flash of your blade to fell distant foes.
Enveloping your body in your Battle Aura provides a defensive shell against attacks; mastery of this will allow you to become impenetrable to most physical attacks. Extending your aura to your clothing and armor will extend their durability by an equal measure. Defensive use of your aura will grant you an improved sense of your surroundings and the battlefield at large.
Your initial mastery of Battle Aura places you at the Advanced Rank of a sword-fighting school of your choice, Sword God style, Water God style, or North God style. Understanding the fundamentals of your style and continued physical training will see you progress to the Saint Rank and maybe, one day, even King or Emperor Rank.