Fifth Boundary Interface Prime Field Device

Fifth Boundary Interface Prime Field Device (次元境界接触用素体No.5, Jigen Kyōkai Sesshokuyō Sotai Nanbā Faibu) was a Boundary Interface Prime Field Device modelled after a "girl from a hundred years ago and was consumed by her brother", and the 'mother' of Ragna the Bloodedge, Jin Kisaragi, and Saya.

She was first mentioned in BlazBlue: Central Fiction.

Appearance
As a perfect copy of a girl who take the same form of Izanami's vessel, No.5 looked identical to her.

Powers and Abilities
Relius Clover describes No.5 as a miracle. She was a creature that, by all means, should not have existed at all. No.5 was a perfect copy of the girl who was her basis, Relius states that one could even go as far as to say that No.5 was her reincarnation. As such, No.5 had all of the same abilities of her basis, such as amplifying seithr indefinitely, devour the souls of humans, and take the power for herself.

Trivia

 * Relius mentioned to Izanami about a girl he once met in the past who was a monster and the basis for the 5th Boundary Interface Prime Field Device. The description matches Saya Terumi exactly.