Following the Devastation of Parnassos and the abandonment by Con Star, the population fell into extreme divides. Leaders known as Arratu tried to keep the population under control using the arena. They also sent out raiding parties to capture new participants.
Around 24 ABY, the raiders captured a Scyre raiding party assisting First Order forces. The warrior Phasma dominated in the arena, allowing her to kill the current Arratu, becoming one herself. She then abandoned the city to continue towards the dead lands on her quest with General Brendol Hux to reach his crashed starship.
Before leaving Parnassos with Phasma and the Scyre child Frey, Hux had the Finalizer destroy Arratu Station from orbit with it's Turbolasers as a demonstration of the First Order's power.