Glenn's Secret Tri-Sorcery

Glenn's Secret Tri-Sorcery (Ch. 62) - sorcery, which allows to modify ones own life code. These modifications would cause cracks to the life code. Because of this, the sorcery could be performed for the maximum of 3 times. Later in the story, Glenn found a way to heal the life code, using Ginseng Orchad (Ch. 95), in this way bypassing the initial limit of the sorcery.