Ou no Shinboru

This jutsu, nicknamed the Photosynthesis Technique, is taught to all members of the Tetsugaku Clan who master the clan's kekkei genkai, Photo Release. Essentially, it allows the user to direct their chakra to absorb all incoming light rays into themselves, converting it into more chakra which they can use. The amount of chakra generated would depend on the user's endurance, as the intake of light will damage the user with an intensity that depends on how long the jutsu is active. In the hands of a foolhardy user, it is possible to kill oneself with the use of this jutsu.