Way of Martial Knowledge is a light armor set. While your Stamina is below 50%, your Light Attacks cause the enemy to take 8% additional damage for 5 seconds. This effect can occur once every 8 seconds.
Way of Martial Knowledge is part of the base game and drops in Craglorn in the Overland content. You can also find it on Guild Traders. Each set item is bound on equip. You can acquire light armor, jewelry and weapons for this set in the Yokudan motif style.