|“||It's my job to know everything, Phasma. But don't fret, my dear Captain. It's also my job to keep secrets.||„|
Terex was a human male who served as a stormtrooper designated TK-603 in the Galactic Empire. In the years following the Battle of Jakku, Terex became the leader of a crime syndicate on Kaddak known as the Ranc gang. Still determined to rebuild the Empire, Terex joined the First Order, an Imperial remnant that had relocated to the Unknown Regions. By 34 ABY, Terex had become an agent in the First Order's Security Bureau.
Terex was originally an Stormtrooper in the Imperial Army with the designation of TK-603 who fought during the Battle of Jakku before later defecting with TK-605 and surviving on Jakku for a few years before the two built a ship in which they escaped the planet. He later founded the criminal organization, the Ranc gang, and led it for several years before he handed it's leadership over to Wisper.
Years later, Terex joined the First Order and become an Agent in the First Order Security Bureau and fought against the Resistance during the First Order - Resistance conflict. Terex and his stormtroopers would encounter Resistance pilot Poe Dameron and his Black Squadron during this conflict frequently.
Terex eventually reclaimed his leadership of Ranc gang in an attempt to trap Poe but the First Order arrived and took out the Carrion Spike and all the rest of the gang's forces, taking Terex in.
After taking him in, the First Order punished Terex severely, torturing him and transforming him into a cyborg programed to be eternally loyal to the First Order.