Psionic Membrane

Description
Psionic Membrane could be considered a work of art, built around Jay's own brain. During the short scuffle between him and his comrade, Tobias, Jay was subjected to an attack that attacked his neurological impulses rather directly. Seeing as how it wasn't Genjutsu, he was rendered immobile and was forced to improvise a strategic withdrawal from the bout. As Tobias awaited his reappearance, the Nara would have the much needed time to figure out a way to undo the possible permanent damage to his neurological synapses.

With the use of Suguwara no Michizane, the Nara was able to get a better grasp of the inner pathways of his own brain and began to fix the problems he had been left with. In the process of fixing the problem, he figured that he should spend a bit more time to develop something that would prevent such occurrences from happening in the future. What he came up with was this work of art, a film of energy that would immediately halt unauthorized intrusions into his mind/brain.

After many trials and errors, and careful tweaks in the right ways, he's updated the skill to work on most Genjutsu as well. This left only the strongest techniques that could work on him, if he didn't have his Sharingan activated beforehand.

Weakness
The only weakness to this film of energy, is that it is breakable with attack after mental attack against it. Working much like a firewall, this series of brute force attacks will continue to weaken it until it actually breaks.

The type of Genjutsu techniques required are the ones that really attempt to do mental damage to the target, much like Tsukuyomi or Izanami, to name a few.