Fay, initially designated Phalanx and later renamed PH4-LNX, is a droid built by Czerka Corporation utilizing Iokath technological advancements. Having once belonged to Godoba, a Hutt, she fled his control and subsequently affiliated herself with the Gambling Authority and Management Entity. Seeking to refine her combat capabilities, she eventually petitioned the then-Commander of the Eternal Alliance for membership.
The history of PH4-LNX varies based on whether the Knights of the Eternal Throne expansion has been completed. If the player hasn't experienced the expansion, her origin is rooted in a mass production line of droids leveraging Iokath tech acquired illegally by Czerka. Conversely, with the expansion, she is depicted as a droid detached from the Eternal Throne's collective consciousness, roaming the galaxy until Czerka captured her. Ultimately, she secured a position within Goboda the Hutt's Shadow Syndicate.
Her design served as the inspiration for the robot 50R-T, who appears in Star Wars: Galaxy of Heroes.