Fallen Angel

Copai'eri'jhu tr'Khasei is a telepathic entity composed of the conscousnesses of Traklamek tr'Khasei, Dr. Vlaxina Sev, and Aryien.

Birth and the Early Years
In the first year that Traklamek led raiding teams to aid the tr'Khasei clan in gathering supplies, he was taken captive by an insane Betazoid scientist named Vlaxina Sev. After being tortured for weeks, he was taken to an empty room, and strapped into a chair next to a Romulan woman he'd never seen. Dr. Sev then stepped between them and placed her hands on the katra points of each of their faces. A crude mindmeld commenced, and Fallen awoke. As her first act, she snapped the mind of Dr. Sev, killing her. Fallen then entered body of Aryien, the Romulan woman, and the three of them escaped.

Fallen spent the first ten years of her life under Aryien's tutelage, the woman teaching her  everything she needed to know about being a mercenary, but nothing about being a person. Aryien saw her as a weapon to be honed, nothing more.

The Dark Within
When Fallen was eight years old, Aryien was hired to assassinate a Klingon general named M'Tagra. After killing the general, she was attacked by the general's bodyguard, a Caitian named Spitfire. Spitfire angered her enough to release the remnant of Dr. Sev within her, and Fallen quickly turned the staff of the outpost against each other. Within minutes, the entire outpost was dead, aside from Fallen/Aryien and Spitfire.

Around that time, she started referring to Traklamek and Aryien as her parents.

See Chronicled Event: The Dark Within

Lucky Number 8
Not long after her tenth birthday, Fallen met a Starfleet Captain named Sarah Thorson. They became good friends, and spent a lot of time together.

After awhile, Fallen noticed her feelings for Sarah beginning to increase, and decided to do something about it.