Teiōgan Altar

The is a tablet which was inscribed by the First Yamakage, Ryun Uchiha, and was inherited by his descendants: the Abura Clan. It has rested in the ruins of the Higurashi Shrine for over 300 years. It is conversely known as the.

Overview
Contained on the stone is Ryun's knowledge of the Sharingan and Mangekyō Sharingan, the true secrets to awakening the Rinnegan, and the known history of Hagoromo Ōtsutsuki: the Sage of the Six Paths. According to Yukimaru Kirigakure, Ryun did this to ensure that future generations of Uchiha would not soon forget their heritage and the power contained within their blood. Tora Uchiha notes that the stone contains the same stipulations as the one in Naka Shrine; the base Sharingan can partially read the tablet, the Mangekyō Sharingan can read more, and the Rinnegan can decipher the entire stone.

Being a genetic descendant of the Sharingan and Rinnegan, the Teiōgan can also read the contents of the stone monument. At some point, following Ryun's death, his granddaughter, Abura Uchiha, added to the shrine: leaving, for her descendants, the workings and mechanics of her unique ocular power, the Teiōgan.