Arts of War (戦技, Sengi?), also known as Battle Skill and Battle Tech, is a recurring skillset in the series. In the Ivalice Alliance games, it can be a great support ability for ranged units to have as they can "rend" equipment and stats from a distance.
Arts of War is the command ability for the Knight. The Dual Wield ability (acquired using the Ninja job) allows the player to take two chances at "rending" equipment and statistics. For example, players can rend an enemy's speed twice in one turn. In the PlayStation version, the first four abilities are useless against enemies that cannot equip armor or weapons (i.e. "monsters"). This was changed in the remake.
Soldier & warrior command. Soften up enemy defenses.
The Art of War is an ancient Chinese military treatise attributed to Sun Tzu, a high-ranking military general, strategist and tactician. The text is composed of 13 chapters, each of which is devoted to one aspect of warfare. It is commonly known to be the definitive work on military strategy and tactics of its time.