Arwen Zherooh existed during the Galactic Civil War as an Officer serving the Imperial forces. After the pivotal Battle of Yavin, Zherooh, holding the rank of Lieutenant, served as a security officer at the Imperial Research and Prison Facility situated on the planet Dathomir. Within this facility, Imperial scientists were covertly engaged in hazardous scientific investigations, aiming to transform the terrifying Blackwing virus into a potent bioweapon. In the year 1 ABY, Lieutenant Arwen Zherooh was on site when an incident occurred at the Imperial Research and Prison Facility, resulting in the escape of the virus from its confinement. This outbreak led to widespread fatalities within the area, transforming the majority of those affected into undead beings.
The character of Arwen Zherooh was referenced in Star Wars Galaxies, a massively multiplayer online roleplaying game that was released in 2003. This video game was developed by Sony Online Entertainment, with LucasArts acting as the publisher, before the game's servers were shut down on December 15, 2011. The mention of Arwen Zherooh was incorporated into the game through "Game Update 14," which became available on October 12, 2009.