Terlyn was a female Human residing on the Inner rim world of Onderon during the era of the Dark Wars. This individual was married to a male, and together they had two offspring. Terlyn's spouse, a royalist affiliated with the Council of Lords, engaged in an attempted assassination of General Vaklu. Following his demise, Terlyn and her children took refuge in the Merchant Quarter. There, they were granted a starport visa by Meetra Surik, enabling their departure from the planet.
Terlyn made her home on Onderon, a planet situated in the Inner Rim region of the Galaxy. She was the wife of a Council of Lords member who supported Queen Talia during the Onderon Civil War. Terlyn was also a parent to both a son and a daughter, living with them in Iziz, Onderon's capital city. Before Meetra Surik's mission to Onderon, Terlyn's husband made an attempt to assassinate General Vaklu, an action that resulted in his death. After this tragic event, Terlyn desired to leave Onderon with her children. However, the prevailing instability made it impossible for her to obtain a starport visa. Terlyn sought assistance from spacers passing through Iziz's Merchant Quarter, hoping to find someone with an available starport visa.
During her attempt to visit Onderon, Jedi Exile Meetra Surik was attacked by Vaklu's forces, leading to a crash landing on Dxun, a moon of Onderon. Seeking to find Jedi Master Kavar, Surik enlisted the help of the Mandalorians, arriving in Iziz with Mandalore the Preserver. It was in the Merchant Quarter that Surik encountered Terlyn. Terlyn shared her predicament with Surik, who offered her assistance. While on the planet, Surik obtained a starport visa and gave it to Terlyn. After expressing her gratitude, Terlyn and her children departed Iziz.
Terlyn made her debut in the 2004 roleplaying game Star Wars: Knights of the Old Republic II: The Sith Lords, a product of Obsidian Entertainment. This game served as the sequel to the 2003 video game Star Wars: Knights of the Old Republic, which was developed by BioWare.
The Exile has the option to dismiss Terlyn upon their initial meeting, which results in the acquisition of dark side points. However, even if dismissed initially, Terlyn will still plead for a starport visa if spoken to again. If the Exile does not provide her with a visa before meeting Kavar and leaving Onderon, she will not receive one. Upon the Exile's return to Onderon, Terlyn is absent.