“Devils are evil creatures from the plane of order. Though they are lawful, they support the ideals of law through domination and foul acts. They respect lawfulness, but a twisted form that is heavily infused with treachery and deceit. They adhere to an order of command with arch-devils at the top of the hierarchy. Particularly powerful arch-devils rule their own domain on the plane of order (a kind of demi-plane), and sometimes encroach upon the plane of balance. Devils are divided into three main types, lesser, greater, and arch-devils. Arch-devils, like demon lords, are unique beings. The lesser and greater devils belong to devilish races, and arch-devils may promote individuals that transform into a new race until they work their way toward becoming an arch-devil (a rare event). There is overlap in the power of lesser and greater devils, with some of the most powerful lesser devils being more powerful than the less powerful of the greater devils. However, this is the price of promotion and ambition in the devil hierarchy, and some lesser devils choose to remain of lower rank to bask in this power.”
- Labyrinth Lord Advanced Edition Companion
Not exactly. “Devils” belong to the tribe of Shaitan, of the Ifrit (in the Eastern lands, where the Gods and mankind arose). Their seat of power was the brass city Irem of the pillars, until they were cast down. They are of Law, but are malevolent and without pity. They are the lash that the gods employ when it becomes necessary to punish mankind. They are not of Tiamat, or chaos.
They are the wardens and torturers of the underworld (irṣitu), may the gods have mercy on those they encounter while striding the earth (an event as rare as it is surely deadly).