User blog comment:Dae gaea/manga/@comment-33724382-20180721154620/@comment-36140723-20180726092441

Precisely: evidenced after Touya found the Alchemy Lab along with Bell Flora(I think it was LN Volume 5, if I do recall). They are products of Babylon's biomechanical engineering. So, to put it simply. The professor created "T-800s".