Syril Karn was a human male Deputy Inspector who lived during the Imperial Era, and chased Cassian Jeron Andor and Luthen Rael on Ferrix. Following his disastrous failure to arrest Cassian Andor, Karn was stripped of his duties and left utterly disgraced by his superiors.

Having identified Andor as his target, Karn summoned a sergeant who commanded a Pre-Mor security team, Sergeant Linus Mosk. Karn was impressed by Mosk’s enthusiasm to capture Andor, finally finding a kindred spirit in someone who took their duties as seriously as he did. Mosk recommended the two of them lead a 12-man team to capture Andor on Ferrix promptly. Karn agreed and the two later departed with twelve men to Ferrix to arrest Andor.

During the trip to Ferrix, Mosk appraised his team of the situation, warning that Andor was likely armed and dangerous. He then allowed Karn a moment to speak to the men, with Karn delivering an awkward and uninspired speech to the team. Upon arrival at Ferrix, Mosk and Karn attempted to deliver the arrest warrant to Andor’s adoptive mother Maarva. Upon discovering Andor was not present, the Pre-Mor soldiers ransacked her home in an attempt to coerce her into giving up Andor’s location. This upset many locals who were friends of Maarva, however, and many more were upset to see security officers mistreating an old woman. The town quickly began to turn on the Pre-Mor soldiers, sabotaging them by ringing alarms to warn of their location and taking down street signs to prevent the soldiers from knowing where they were.

Eventually Andor and his new compatriot Luthen Rael were found, but the pair were able to escape, injuring numerous Pre-Mor soldiers in the process. When Karn and Mosk heard reports that Andor and Luthen were headed their way, they and the remaining Pre-Mor security officers attempted to set an ambush for the two, setting up in positions along the street they expected them to come down.

As Karn got into position, however, he was easily ambushed and disarmed by Andor and Luthen, and when threatened quickly gave up the numbers of the Pre-More security team. Despite Luthen’s urging to kill Karn Andor instead gagged and hogtied him, leaving him in a nearby home. Karn was soon discovered by another Pre-Mor security officer and released. Karn saw a speeder departing and, assuming it was Andor and Luthen, called all Pre-More soldiers to begin firing on the speeder. After disabling the speeder Karn was shocked to see a second speeder carrying Luthen and Andor to safety, while the first speeder, rigged with explosives, detonated, killing and injuring more Pre-More security officers. Stunned by the loss of so many men and in shock at the situation, Karn simply stared blankly as Sergeant Mosk attempted to gather his men for evacuation. Mosk urged Karn to evacuate with him and when Karn did not respond Mosk screamed into Karn’s face. When even this did not work Mosk physically grabbed Karn and dragged him to the evacuation craft.