Itaidōshin

Itaidōshin (異体同心) also known as  is the rare  of the Akizuki Clan.

Abilities
It gives the twins the unique ability to break their bodies down to a molecular level. Allowing them to share the same body but can also use it to merge with the bodies of others and destroy the host's cells from the inside. Stronger users are able to unlock multiple different uses of the kekkei genkai

Weaknesses
One of the major weakness of the Itaidōshin is the longer one of the twins remain in the others body, the weaker they becomes and the stronger the other becomes. If enough time has passed the other twin with be completely absorbed by the other. When merged with another, if the host is damaged the respected twin with be damaged as well.

Trivia

 * Itaidōshin a Japanese four-character idiomatic phrase, meaning "Harmony of mind between two persons; two persons acting in perfect accord".