So we know that Yang release can be utilized to preform a unique type of medical ninjutsu, so to speak. Yet we don't really know what Yin Release does. I do have a theory that as Yang release is to healing and medical ninjutsu due to its vitality theme, Yin release is to genjutsu, as shown by the Second Mizukage, due to it's theme of creation and imagination. Is this all it can be for? i honestly don't know. So what are your guys' ideas?