Demonic Illusion Second Databook

Demonic Illusion: Mirror Heaven and Earth Change (Magen: Kyou Tenchi-ten)
Genjutsu, Kekkei Genkai, Supplementary, Close range
User(s): Uchiha Itachi
The mechanics of a false image is duplicated by these eyes, its effects largely turned back onto the enemy!!

One decrypts a Genjutsu that has been applied onto them, and casts back a jutsu with identical effects onto the opponent!! It’s a form of illusion reversal, but in order to instantly read through a jutsu and cast it in return, the Sharingan’s power is necessary. As Genjutsu is initially used to confuse the enemy, this technique which sends it right back to its caster deals a high amount of mental damage, more than anything else. Every half-baked Genjutsu will fall prey to the mirror that is Sharingan!!

Conditions such as the presence or not of a Kekkei Genkai and the relative strength of both casters play a great part when operating this jutsu.

Thanks to the Sharingan’s power, Itachi uses a similar technique.