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. It resembles a giant, golden robotic satellite with several curtain-like attachments on it and an eye-like screen with the Black Beast's crest on it. In Chronophantasma, Relius Clover made Nu-13 and Noel Vermillion synchronize, allowing Nu to fool the Master Unit into revealing itself by posing as the Successor of the Azure. Izanami tried to destroy it by using Take-Mikazuchi but Rachel Alucard protected the Master Unit with the Tsukuyomi Unit. By the end of the game, it remains hovering in the sky over Ibukido with the Tsukuyomi Unit still protecting it.
 * 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 appears that in order to use it, one must sacrifice their body and have their soul inhabit the armor, effectively making the armor their new body. Jin Kisaragi was on the verge of death after being thrown through the Boundary, so Rachel Alucard offered it to him so he could become a "real hero", taking on the moniker Hakumen as a result. During Calamity Trigger, he is partially salvaged from the Edge by Kokonoe and as a result can only use 20% of his original power. Before Jin obtains it, the Susano'o Unit was originally wielded by Terumi, but he separated it from his soul when he discovered that it bound him to the Amaterasu Unit, hence why he is now a ghost. Hakumen is the White Susano'o while Hazama was the Black Susano'o. The Susano'o Unit's true purpose is to slash time without the risk of a paradox.
 * 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. 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.” (第零式拘束機関解放、次元干渉虚数方陣展開、固有境界に接続、ツクヨミユニット、起動.)