Rose of Perseus
ARCs were developed by Ryu Hitomi after he had a revelatory experience in which he felt The Word, gaining an innate understanding of machine intelligence and the ability to merge with a properly designed machine. The Word gave Hitomi the knowledge he needed in order to build the first ARC.
Because it is shackled to an individual operator, instead of being tied to a shared central computing network like the Morpheans, the ARC pseudo-A.I. is usually capable of faster and more complex calculations than one of the ancient Morphean starships would be able to compute. This freedom has led to increasingly advanced Ascendants being built over the past century and a half.