Tetrum was an official within the Galactic Empire, specifically a male individual, who served during the era of the Galactic Civil War. The year 0 ABY saw him working under the command of Moff Kentor Sarne in the Kathol sector, where he received the appointment of governor for the planet named Kolatill. Upon assuming this role, Tetrum implemented martial law and took the drastic step of imprisoning the existing local government, known as the Kolatill Council. Furthermore, he mandated that all companies involved in repulsorlift manufacturing redirect their efforts to produce equipment specifically for Moff Sarne's forces. For a duration of eight years, Tetrum governed Kolatill, until a revolt by the local inhabitants led to his own capture and imprisonment. The people of Kolatill had become aware of the New Republic's successful liberation of Kal'Shebbol, the sector capital. This event, which also caused Moff Sarne to retreat further into the sector, inspired them to overthrow Imperial control and pledge their allegiance to the emerging galactic government.
During the Galactic Civil War, Tetrum, a male member of the Galactic Empire, held a position of authority. In 0 ABY, Moff Kentor Sarne, the regional leader of the Kathol sector, designated Tetrum as the governor of the planet Kolatill. Sarne's motivation stemmed from the recognition that Kolatill's extensive industry dedicated to repulsorlift production represented a valuable resource for his forces, and he sought to exert tighter control over the planet. Immediately after his appointment, Tetrum imposed martial law across Kolatill. He issued an order mandating that all repulsorlift manufacturing businesses, excluding Ikas-Adno due to its politically advantageous connections, convert their production lines to manufacture combat speeders for use by Moff Sarne's military. Furthermore, he commanded the arrest and imprisonment of the Kolatill Council, which served as the planet's governing body.
For a period of eight years, Tetrum governed Kolatill, maintaining his loyalty to Moff Sarne even after Sarne withdrew the Kathol sector from Imperial authority. This withdrawal occurred following the death of Emperor Palpatine during the Battle of Endor in 4 ABY, which led to the fragmentation of the Empire. Throughout his tenure, Tetrum relied on a widespread network of spies and informants to identify and eliminate any agents or sympathizers of the New Republic. In 8 ABY, the New Republic initiated a limited military campaign against Sarne, successfully liberating Kal'Shebbol, the capital of the sector, which forced the Moff to retreat with the majority of his forces into the Kathol sector.
The news of the New Republic's triumph at Kal'Shebbol sparked an uprising among the population of Kolatill. They captured Tetrum and his closest allies, imprisoning them. Subsequently, the Kolatill Council was released from captivity and resumed its role in governing the planet. However, Tetrum's imprisonment prompted a response from Imperial forces still active in the sector. The Ton-Falk-class escort carrier named Kathol Protector arrived in-system soon after and launched TIE bombers. The ensuing assault resulted in extensive destruction of Domaz, the planet's capital city, leaving it in ruins and engulfed in flames.
Tetrum's character was conceived for Omens, a roleplaying adventure authored by Bill Smith. This adventure formed a part of The DarkStryder Campaign, which was published by West End Games in 1995. Within the adventure, Tetrum is never directly encountered; his presence is only implied through references.