Yin-Yang Release: Reality of Dreams

Using the power of the Yin-Yang Release, the user forms a small, invisible sphere around himself. Using the principles of Izanagi, this defensive orb renders any ninjutsu or ranged attack which is directed to the user, to be useless.

Mechanics
The usage of this technique is straight forward and fairly simple. As the Yin Release and Yang Releases represent imagination and matter, this defence revolves around converting an opponent's attack into an illusion.

The sphere which surrounds the user means that any attack which impacts the sphere is immediately converted into an illusion, thus leaving the user completely safe. Any attack, no matter what magnitude or power is simply phased out of existence the moment it touches the sphere.

This ancient technique provides a 100% successful defence from any attack, and simply cannot fail when any ranged attack hits it. This is the source behind the Katsuro Minoru's fabled defence.

The sphere can also be expanded or pulled back, resulting in a flexible defence if enemies get too close. Attacks like the Rasengan simply are not able to be sustained in the sphere, as they disappear out of existence almost immediately.

Weaknesses
While it provides a full defence from the sides, the sphere only surrounds it's user. The bottom of the user is left completely exposed, and skilled opponents can use this disadvantage to attack from underneath and land a decisive blow.

The sphere of Yin-Yang energy also weakens in 10 second intervals. At the wrong moment, it may suddenly and temporarily dissipate, leaving the user momentarily and suddenly defenceless. However this is a difficult flaw to spot, as the sphere of energy is invisible either way.

Another glancing weakness to the ultimate defence is that for some unknown reason, actual human beings can pass straight through the sphere, without having their existences erased. However sending a shadow clone or any clone through the sphere will result in the erasion of the clone, simply nullifying it as it is a form of ninjutsu.