Work began soon after the cancellation of an "Unreal Tournament" add-on pack that the development team had previously been building. Deciding to continue to use the Unreal Engine, work began on a what would become "Devastation" in 2000. As development progressed the engine received numerous upgrades, by its release using a modified version of the engine used in "Unreal Tournament 2003". Additions included changes to the engines skeletal system, work on a new particle and special effects system called OFX, and the introduction of the MathEngine's Karma Physics.