Genjutsu Cursed Seal

A technique that manifest a spiral cursed seal on a person, afterwhich the genjutsu that is cast allows the victim to be manipulated into believing information told by the user. The technique apparently requires regular reapplications as gradually, the mark fades away, causing the victim's true memories to resurface in a migraine-inducing headache.

Trivia

 * The marking of the technique is used as the Byakuya Gang's insignia.