Eternal Mangekyō Sharingan

Eternal Mangekyo Sharingan — the final form of the Mangekyo Sharingan, achieved by transplanting the eyes of a blood relative with the strongest bond, ideally a sibling. This procedure not only fully restores lost vision, but also permanently eliminates all negative consequences of using the dōjutsu: excruciating pain disappears, chakra consumption decreases to an imperceptible minimum, and the eyes never again lose their light.

Upon merging, the eye pattern combines traits of both bearers, however the techniques of the transplanted eyes are lost, while the abilities of the owner's original eyes are preserved and enhanced. The eyes are still recognized as belonging to the original owner and react to techniques targeting him specifically. According to Madara Uchiha, obtaining the Eternal Mangekyo Sharingan serves as proof that a shinobi of the Uchiha clan continues to move forward despite the losses they have endured.