Shinkōkin

The Shinkōkin (神光菌, Divine Light Bacteria) is a nano-scale, bioluminescent bacterium capable of emitting and controlling light. It is utilized through the Pathogen Incubation Asylum. Utilizing in combination with  allows the bacterium to produce light at will, which s within it allows it to change its color at will. By feeding the bacterium their chakra, the user is able to control this process, allowing the user to produce light at will. By further taking control of the chakra the bacterium produces within its body and infusing it into the light, the user is able to produce and. This makes the bacterium a great medium for casting, as well as creating visual illusions.

Because photons don't generally interact with one another, as well as its and probabilistic size, it is impossible to see chakra infused into them. By reflecting light around itself, the bacterium can render itself completely invisible. Alternatively, it can utilize its chromatophores to camouflage itself and thus its user, allowing them to blend into their surrounds. When combined with its ability to solidify light, the bacterium is capable of changing its texture, allowing the user to literally fool targets without need to cast genjutsu, though doing so will immerse affected targets that much more.