Sankishin

The Sankishin (三輝神), also known as the Original Units (オリジナルユニット), served as the inspiration for the Nox Nyctores, though little else is known about them.

Amaterasu Unit
The Amaterasu Unit (アマテラスユニット), also known as the Master Unit (マスターユニット). Uniquely, it lies hidden within the Boundary and can only be found by the true possessor of the Azure. It is also the cause of all the timeloops. Noel Vermillion is called the Master Unit's Eye, implying that the Master Unit is what confers the power of the Boundary upon an individual. Since Saya "brought ruin" to the Master Unit, this would explain why Noel lost her stationed power as Eye of the Azure. Whether this means that in the future she is the one destined to wield the Master Unit remains to be seen.
 * Owner: Unknown
 * Namesake: Amaterasu, the Sun Goddess (天照大神)
 * Release command: Unknown

Susano'o Unit
The Susano'o Unit (スサノヲユニット), its full capacity is unknown, though it seems that Hakumen's soul is bound to it; when Jin Kisaragi was on the verge of death, Rachel Alucard installed him into the Unit. Because he was not fully salvaged from the Edge by Kokonoe, he's apparently operating at only about 20% of his full capacity throughout the games. Hakumen is the White Susano'o while Hazama was the Black Susano'o. It is stated by Relius Clover in his Story Mode that the Susano'o Unit's true purpose is to slash time.
 * Owner: Hakumen, previously Yūki Terumi
 * Namesake: Susano'o, the Storm God (須佐之男命)
 * Release command: Unknown

Tsukuyomi Unit
The Tsukuyomi Unit (ツクヨミユニット) is described as an ultimate defense and resembles a giant golden shield. It also grants Rachel mastery over sorcery, making her one of the strongest characters. It is stated by Relius Clover in his Story Mode that the Tsukuyomi Unit's true purpose is to protect time.
 * Owner: Rachel Alucard
 * Namesake: Tsukuyomi, the Moon God (月讀命)
 * Release command: „Nulliplex restriction mechanism release, dimensional interruption imaginary number developing. Connecting to congenital border. Activating Tsukuyomi Unit.” (第零式拘束機関開放、次元干渉虚数法陣展開、固有境界に接続、ツクヨミユニット、起動.)