Sakayume

The Sakayume (逆夢, Contradictory Dream) is a unique variant of Yin-Yang Release developed by Musashi Kōyō following research into the fabled Izanagi of the Uchiha Clan. It, quite literally, possesses the ability to affect the "personal reality" of any object or chakra-based entity that it comes into contact with. For this reason, it is a potent tool in combat, but it must be utilized with extreme precision and accuracy, otherwise one's chakra reserves will be depleted in almost an instant.

In order to achieve this effect of manipulating the "personal reality" of a specific target, Musashi requires the use of his sensory prowess as a means to "lock on" to the said target of his choosing. Upon doing so, Musashi subsequently begins to exert his chakra and mold it to surround the target of his choosing. However, utilizing this method is best reserved for ambushing purposes, and cannot be utilized in the heat of combat. Therefore, Musashi has another method of utilizing it. By placing the required chakra directly in contact with the target - whether it be through a medium or otherwise - Musashi is capable of subsequently spreading this chakra as he sees fit, requiring less concentration than the initial method of utilizing this technique.

When this said "field" of chakra envelops the required target, Musashi utilizes a simple hand seal in order to convert the targeted material into an opposite state of existence: physical becomes spiritual, spiritual becomes physical. This is done so through the mechanics of the Yin-Yang Release when dealing with spiritual and physical spectrums. By being surrounded in chakra that is perfectly balanced with Yin and Yang, Musashi creates a temporary moment in which the substance is at the "boundary" of spiritual and physical, thanks to the influence of the balance upon it. From herein, Musashi is able to cause Yin-based chakra to swallow the said target into a spiritual existence - an illusion. Or, Musashi is capable of using Yang-based chakra to provide vitality to the said target - in terms of Ninjutsu, strengthen it.

The technique's usage is vast and capable of numerous tasks based on what Musashi wishes it to do. However, in exchange, a few weaknesses are prominent within the technique: one cannot manipulate their personal reality and one cannot manipulate the reality of a human or animal. Furthermore, while the chakra cost isn't as great as, say, Izanagi itself, it is quite potent. Therefore, it must be used sparingly, or against small targets, in order to ensureMusashi doesn't lose too much vitality.