Sankishin

The Sankishin (三輝神), also known as the Original Units (オリジナルユニット), they are the base for Nox Nyctores. Unlike the Nox Nyctores, the Original Units draw power directly from the Boundary. This is mentioned in the Tsukuyomi Unit's chant, as well as being shown by the Susano'o Unit being unaffected by Celica's power, while the Amaterasu Unit was physically present within the Boundary itself.

Amaterasu Unit
The Amaterasu Unit (アマテラスユニット), also known as the Master Unit, Amaterasu (マスターユニットアマテラス) or just Master Unit (マスターユニット), is the Original Unit that Hades Izanami, Yūki Terumi and the Takamagahara System are trying to destroy. It is the top Unit of the Original Units.

The Amaterasu Unit was located at the deepest part of the Boundary and could only be found by the Successor of the Azure by being the Master Unit's "Eye". Inside it "sleeps" a girl. The world is made out of her dreams and memory through usage of Phenomenon Intervention. During Chronophantasma she tries to eliminate all conflict that Terumi and Hades Izanami create when they use the Takamagahara System by rewinding time, but the more she does this, the "closer" she must get. When she was close enough, Terumi had Nu -No.13- synchronize with the Eye of the Azure to draw her out into the present world using a gate in the sky called Nemesis Horizon. Izanami tried to destroy it using Gigant: Take-Mikazuchi, but Rachel Alucard protected the Master Unit using her Tsukuyomi Unit. The Amaterasu Unit is still hovering in the sky over the 5th Hierarchical City of Ibukido with the Tsukuyomi Unit still protecting it.

According to Rachel, as opposed to the Takamagahara System, which could only alter major phenomena (ones that may determine the fate of the world), the Amaterasu Unit can intervene and alter any phenomenon it chooses. Another difference between them is that the Master Unit cannot be observed or acknowledged at all, with Successor of the Azure being the sole exception. In a sense, it is closer to being a "God" than the Takamagahara System.

In Centralfiction it was revealed that the Master Unit is empty because its user escaped somehow and Noel seems to have inherited a piece of her soul while Izanami is the manifestation of her Drive.

Susano'o Unit
The Susano'o Unit (スサノヲユニット), also known as Susano'o the Time Cutter (刻斬りのスサノオ), is Hakumen's body itself. Currently, it only uses 20% of its original power. Its true purpose is to slash time without the risk of a paradox. It was originally owned by Yūki Terumi before he forced himself to eject from it. Despite no longer wielding the Susano'o Unit, Terumi seems to have its powers as a side effect. It was shown that the Unit actually houses the user's soul, not their entire body.

It was first excavated by the Japanese Government from the First Area, the same place from where the Black Beast appeared, and was immediately hidden so that nobody would know about it.

Yūki Terumi was going to give it to Relius Clover and Shūichirō Ayatsuki as research data toward the creation of Kusanagi, however it got picked by the Alucard Clan. Rachel Alucard gave it to Jin Kisaragi, who then became Hakumen. It is bound to the Amaterasu Unit.

Hakumen is the White Susano'o, while Terumi is the Black Susano'o.

While the unit itself is an empty vessel, it does seem to possess a will of its own, as in response to Jin's will to unify with it, the unit answered with:

Hakumen would later adapt those words into his battle chant.

Tsukuyomi Unit
The Tsukuyomi Unit (ツクヨミユニット), also known as Tsukuyomi the Time Guardian (刻護りのツクヨミ), is described as an ultimate defense.

Rachel Alucard first uses it to protect Kagutsuchi from Take-Mikazuchi after Noel saves Ragna from merging with Nu -No.13-. She later put its effect on Ragna the Bloodedge when he traveled through the Boundary, although he suffered temporary amnesia. When Hades Izanami attempted to destroy the Amaterasu Unit, Rachel once again uses Tsukuyomi to protect it. It is currently still protecting the Amaterasu Unit.

The Tsukuyomi Unit's true purpose is to protect time.

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.)

Chronophantasma version:
 * "Restriction Zero released, dimensional interference forcefield deployed... Link to Boundary, engaged. Tsukuyomi Unit... Activate." (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.)