Demonic Mirage: Metaphysical Battleground Technique

Magen: Shinsenjou no Jutsu (Demonic Mirage: Metaphysical Battleground Technique)
Genjutsu (Doujutsu) [Fear, Mind-Affecting, Kinjutsu of All Ninja Villages]
Rank: 6 (B-Class);
Range: 30 feet;
Target: One creature;
Duration: Instantaneous;
Saving Throws: (See text);
Chakra Resistance: Yes;
Chakra Cost: 8.

Using this technique, the user is able to trap the target's mind in a fearful illusion that will pit it against itself in an imaginary battlefield, forcing it to fight an enemy of equal strength, and equal weakness. The battle all happens in an instant, but has the potential to be lethal if the subject's concentration wavers.

The subject must make an opposed Int save against the user, which will in turn
determine the winner of the coming battle. Should the save succeed, the subject emerges from its mind a winner, suffering a measly -4 penalty to Int checks until its next turn.

Should the subject fail its save, however, it is painfully defeated and ejected from the battlefield. It suffers a 50 points of damage, a -4 penalty to Int checks for 2 rounds, and loses its next turn. This technique cannot be used again on the same target for 1 minute.