Devils

While all creatures that hail from the Chaos Plane are called demons, there is another type of creature that inhabits the horrible lands of Kaos. Order demons that venture into the plane of Chaos sometime become stuck and corrupted by the forces of Chaos. These creatures are called Devils.
Depending on the original Order Demon, these devils can vary in power greatly, but one thing is almost universally true. Despite the strong influence of Kaos, they remain lawful and follow their previous hierarchal structures amongst themselves.
Depending on their level of corruption, devils can serve the Great Mechanism, any of the Chaos gods or even themselves.