The Corpus engineer, head of R&D for energy creation and propulsion tech upon the d'Argembeau, Dereb Derulian was taken prisoner during a grineer heist. While a researcher, he has military training, and the military detail on board made that unnecessary in most cases. Regardless, after he was taken prisoner, each was killed, including his paramour, the captain of the ship. They kept him alive hoping to use his secrets to improve their own tech. He eventually escaped with Tenno, whos meditation in later days eventually allowed him to tap into a level of the Void. Further research of his own allowed him to additional exposure, and he figured how to tap into the powers he was given.