On September 1, 2004, Digital Illusions CE bought Trauma Studios. Since then, they had been collaborating on creating the first-person shooter Battlefield 2, follow-up to Battlefield 1942. On June 7, 2005, Digital Illusions announced that they had shut down Trauma Studios.
In January, 2006, the team behind Trauma Studios was hired by well-known publisher THQ to create a new internal development studio known as Kaos Studios. Their first game, Frontlines: Fuel of War, was released on February 25, 2008.