Biomechanics

Biomechanics is the science of creating biological beings using a combination of organic and mechanical parts. "True" biomechanics would create a biological being out of entirely mechanical parts: however, this is often theorized to be impossible, or at least infinitely hard.

EL-SUR Biomechanics
EL-SURtech invested heavily into the research and development of biomechanics, eventually resulting in the creation of the Olivia units, which then served as the base for the Mk. I Overseers. T.H.O.R.N. was the result of stolen EL-SURtech research being used to create a biomechanical being.

See also: Overseers
The Mk I Overseers were created by EL-SURtech in order to oversee Vale. After all of them except Zulu were destroyed, the Mk II Overseers took their place. The Mk I Overseers are similarly constructed to the Olivia Units, while the Mk II Overseers are creations of the Axiom Essentiae Ad Infinitum, and only based on the Mk I Overseers. The Overseers are capable of existing in the Aether, as their biomechanical bodies are actual, physical bodies, rather than simply manifestations of Soul.

See also: Ghosttech
Ghosttech is an abandoned branch of biomechanics that was pursued by Hannah Essentiae and Maximillian Essentiae, and continued by Thorn and Theta Essentiae, in an attempt to recreate biomechanical bodies that exist only as Soul.

See also: Historians
The Historians, Thorn and Theta, are biological bodies that Hannah Essentiae and Maximillian Essentiae created to seal themselves in so that they could continue to have physical bodies.

See also: Integer's Studies
Integer Biomechanics were founded by Integer Essentiae after experimenting on the body of a Rank 2 Overseer. By combining the fragments of knowledge remaining in the Essentiae line from the creation of the Historians with the data gathered from the experiments on the demised Rank 2 Overseer, Integer was able to produce an approximation of the NATO Overseers. However, the new being, dubbed Project Aleph, was entirely mechanical. As both Historians and NATO Overseers require souls as their cores, Project Aleph integrated Integer Essentiae into itself, thus creating the only Integral Biomechanical being. The doctor managed to lock himself away in his laboratory, where he would deactivate the biomechanical body of Project Aleph now keeping him alive, and lie dormant for forty years.

Axiomatic Biomechanics
Axiomatic Biomechanics is a continuation of Integer's research. Initially, Axiom focused on imitating surface level traits of Overseers, such as their spirals and masks. However, his true goal was to attempt to create a physical Body so that he could exist in the Aether.