Eighth Symphony

The Kekkei Genkai "Eight Symphony" gives the user complete, natural control and affinity over the Yin Release nature transformation. Because of this, one has a natural, above-average ability to cast abnormal genjutsu. There is, however, quite a difference between the Eight Symphony's genjutsu and ordinary genjutsu, however. First, this genjutsu must be spurred through the use of music, whether it be vocals or an instrument being used as the medium for the technique. As music is induced, the sound waves coming from the music are imbued with Yin-Release chakra, forming a music related technique. Once the target is trapped into the illusion, they will begin to experience peace and tranquility, where as in reality, they are suffering from major head trauma. There is almost no way to escape this genjutsu - even a Mangekyo Sharingan will have trouble breaking through this bloodline limit. One with better control over this Kekkei Genkai will be able to unlock it's second form, which incorporates Yang Release chakra. With that said, the effects of the illusion being used will actually effect in-real-life events. Covering one's ears will have no use, because like other sound-based techniques, it effects the body through the use of constant chakra-imbued vibrations. Exposure to this Kekkei Genkai will also cause weakness, nausea, cold sweats and migraines. Depending on the user and the technique, paralysis is also a side-effect. Unlike other genjutsu, this Kekkei Genkai alters reality to a point where it seems like one is in a lucid dream.

Trivia

 * Though not for certain, it is implied that possesses this Kekkei Genkai.
 * It is said that this is a blood-line limit of legends, because it is extremely rare. Currently the only known user of this Kekkei Genkai is Ken Naoki.