Hakkei (発勁, Hakkei; translated as "explosive/raw power") is a special fighting technique.
The purpose of Hakkei is to allow the fighter to use their energy in an explosive manner with the least amount of actual physical movement possible. In essence, it is the "strike without striking", causing the muscles within the body to actually generate the energy and deliver the force of the attack without actually carrying out the attack. That energy then penetrates deep inside the body resulting in damage to the internal organs but leaving the surface untouched. In doing so, user can attack with immense force even if he is extremely limited in space, allowing him to attack with great strength no matter the situation.