'KI' Martial artists of the shadow class utilize ki, a form of channeled energy, when performing most skills. The process of generating and harnessing ki is a secret passed down through the shadow guild as part of NINJUTSU training. After extensive practice, advanced shadows can completely control their inner energies and channel them through unique, powerful spells known as the FORGOTTEN ARTS. After using a skill, ki will stop regenerating for a short while, but the shadow will gain a little mana from the effort.