Prime Field

The Prime Field (素体) is a special type of artificial human created for the study of the Boundary.

Original world
The Contact Prime Field (接触用素体) is a type of artificial humans created to contact the Amaterasu Unit in the Boundary. The Unit answers only to objects with human form, and people are unable to survive in the Boundary, this is why they created the Prime Fields.

The first Prime Field, later on dubbed as the Origin, who managed to make contact with the Amaterasu Unit, made her known as the. In result, she acquired a soul, self-awareness, and the Power of the Eye, the ability to Observe. With this force, the rest of the Prime Fields gained souls and self-awareness.

People were afraid of the Prime Fields, which were supposed to be used only as tools, and started against them a war.

BlazBlue
The Dimensional Boundary Contact Prime Field (次元境界接触用素体) is a type of artificial humans created from the Magic Element.

It is believed that the very first Contact Prime Field, the Zeroth Prime Field (第零素体), was created by Relius Clover. As a result of one of the experiments, this model contacted the Master Unit and gained the soul, receiving a huge amount of data, and gaining the power of the Blue. This sample was thrown into the Kiln, and the data collected by it was used to create the Takamagahara System.

After that, humanity decided to destroy the Master Unit, creating for this purpose a special Prime Field: Murakumo Unit. Various organizations created samples 2-10 of this type, but none of them could become Kusanagi. During the Ikaruga Civil War, Relius created the 11th, 12th, and 13th Prime Fields, taking Saya as their basis.

Bloodedge Experience
The Dimensional Boundary Contact Prime Field Es (次元境界接触用素体) is a type of artificial human. Kiiro Hikagami is the 7th Prime Field, and is created from the remnats of the other samples destroyed by Spinner Superior.

XBlaze
The Boundary Contact Prime Field Manifestation (示現境界接触用素体), also known as Embryo Storage (エンブリオストレージ), for short Es, is an artificial life form which serves as a back-up vessel for the Embryo. The only known Embryo Storage is Es.

Trivia

 * It was said in BlazBlue: Phase 0 that the Zeroth Prime Field Model (第零型素体) was used in the experiment that resulted in Black Beast's appearance. In BlazBlue: Continuum Shift Extend it was said that the First Prime Field (第一素体) was used in this experiment.
 * BlazBlue Contact Prime Fields' names come from the Greek Alphabet.