The Krupn were a group of assassins on Coruscant led by the Big Boss. In 784 BBY, Gimerhead Ius disappeared. Aryana Loit hired Tergo Shysa to track him down. Tergo discovered Gimerhead had joined the Krupn. Ambrose Ius went to retrieve Gimerhead, but Nerian Biasl betrayed Ambrose's intentions to the Big Boss, who captured Ambrose. Gimerhead himself tried to murder Ambrose, but Aryana killed her own son before he could do so. The Krupn attempted to assassinate Supreme Chancellor Teriben Hadsok, but Ambrose and Aryana thwarted them.