Erno was a male detective who worked at a Peace and Security station in Coronet City in the months following the Battle of Endor. He was divorced from his wife. Shortly before the Coronet City revolution, Erno apprehended a human youth named Remi, who was a member of the Acolytes of the Beyond. Before Erno could finish booking him, he and his fellow detectives were distracted by the Acolytes' attack on Coronet City. Remi then slipped away and obtained a Sith lightsaber from the downstairs archive. After discovering that the Acolyte Kiza had gunned down several of his colleagues, Erno tried to confront her. However, Remi sliced off his blaster hand with his lightsaber. Kiza then spared Erno so that he could warn the others about the Acolytes.