Spirit Transformation Technique

This technique allows the user's spirit to materialise and leave his body, which is then able to take possession of a target, enabling them to freely manipulate the victim's body at will. Dan Katō noted that this technique had been used to kill a great number of shinobi during his lifetime. The only known way to counteract the technique is to trap the user within a barrier, such as the Four Violet Flames Formation, before they can activate it.

With the release of the Summoning: Impure World Reincarnation technique, a reincarnated Dan was capable of taking control of his ascending spirit for a short period of time using this technique. It crossed a vast distance and was still able to manipulate a person's body as well as transfer chakra to them.

Trivia

 * Dan's ability to cause his soul to exit his body makes him reminiscent of an, from Japanese folklore. An ikiryō is a person whose soul can dwell outside his or her body.
 * Tobirama Senju mentioned a forbidden technique which allows him to send his spirit to another human. It's unknown if he was referring to this technique, though.