Who is Benejes Frine from Storm Thief and what is their importance?

Benejes Frine is a faded-era scientist. He appears as a hologram to Rail and Moa. In the end, we learn that Benejes Frine is also one of the scientists, who created the Fulcrum and the Chaos Engine at its heart, responsible for all of the probability storms and the creation of the Revenants.