Tephan, a human female stormtrooper, was part of Commander Kimmund's unit within Darth Vader's First Legion. Her role involved piloting the unit's transport, named the Darkhawk. During the Imperial Era, she participated in the Galactic Empire's confrontation against the Grysks on the planet Batuu.
Serving as both a pilot and a stormtrooper, Tephan was a member of the First Legion during the Galactic Empire's reign. As part of Commander Kimmund's unit, she accompanied Darth Vader on a mission that took them to Batuu and Mokivj.
Timothy Zahn's 2018 novel, Thrawn: Alliances, marked Tephan's initial appearance.