Kasstroff, a Human commander of the reconstituted Sith Empire, was a male who existed during the era of the Cold War with the Galactic Republic. He belonged to the small group of Imperial soldiers dispatched to secretly enter Coruscant, the Republic's main world. Within the Galactic City's the Works area, Kasstroff encountered the well-known criminal Skavak, who gave him the valuable Murustavan Ruby. Miel Muwn, Corso Riggs, and Voidhound disrupted their rendezvous, and during the resulting battle, Kasstroff mortally injured Muwn, but was subsequently killed. It was only after this that Voidhound realized the Ruby was a fake, rendering the fatalities meaningless.