Hametsugan

Hametsugan (破滅眼,Ruin Eye) is a unique dōjutsu and genetic mutation that awoke in the eye of the Amaya Uchiha.

Overview
Stated by her father…, after being banished from the Uchiha Clan for his experiments and the death of his wife at the hands of a Hyūga. Due to his ever-growing hatred for the clans, he sought for a way to surpass the two. With years of studying the two clans and how one awakens the Sharingan. He developed a theory that the powers of the clans of could be united into a single being and give birth to a new power. Using his Mangekō Sharingan, he enslaved a pregnant Hyūga and upon her giving birth, he took the child and killed the Hyūga. Returning to his lab, he took the eyes of the child and transplanted them into his infant daughter. Before disposing of the infant Hyūga, he sealed its chakra and a portion of its blood into his child. Before he could see the fruits of his labor, he was kill by Madara Uchiha who had awakened a new tier of. Before being able to kill the infant, a jutsu that was implanted into the child's eyes activated, warping the child away.

Trivia

 * The name for this dōjutsu was coined by Amaya's father, stating that it would bring Ruin to the Uchiha and Hyūga Clan