Illusion Detection Seal

A seal placed on the back of the neck which detects the flow of chakra in the wearer's brain. If placed under an illusion technique, this seal will pick up on the irregularities in the chakra of the cerebral nervous system. Upon detection, the seal inserts an additional hallucination into the wearer's mind, causing them to see or hear a specific signal set to alert them of the illusion's presence. For Uematsu Tomi, this sign is the appearance of a three legged black crow on his shoulder bearing his own original Mangekyō Sharingan in its eyes.