Prime Field

Boundary Interface Prime Field Devices (次元境界接触用素体, Jigen Kyōkai Sesshokuyō Sotai) are artificially made beings created by Relius Clover and Yūki Terumi.

They were originally designed to explore the other side of the Boundary, as humans can not survive on the other side. When the original prime field device was sent to the heart of the Boundary, it gained a soul and also became the Eye of the Azure, becoming godlike.

The humans feared this, so they tried to eliminate it, but failed in doing so. They then decided to seal it away in the deepest part of the Boundary. The humans then proceeded to create copies of the original prime field device, known as Murakumo Units to try and harness the power of the Azure. As soon as one returned from the Boundary, its emotions would be sealed, turning it into a weapon that could be controlled. As of now only 13 have been created, and only 3 are known.