This is not an attack as much as it is a trait or technique. Healing is done by shamans who are capable of recovering wounds going from fatal to almost instantly healthy again, although inner organs take longer time to recover. The ability behind this technique is that normally, human beings are born with recovering cells, but what shamans do is that they speed up this process naturally. Therefore healings incredibly essential when going up against stronger opponents. Regeneration, is a technique done in which the user can recover after almost fatal blows, making user almost inpossible to defeat via martial arts or sword skills, they usually are only defeated by techniques in whcih invoke special magical or power based attacks, such as elemental techniques.