Devil

Devils were a lawful evil race of fiends who hailed from the Nine Hells of Baator, a dominion of the Astral Sea ruled over by the god Asmodeus. True to their alignment, devils were locked into a strict hierarchy which culminated with the Lords of the Nine, the powerful rulers of the Hells.

Baatezu
This ruling class of devils ruled tyrannically over their domains in Baator.

Abishai
Abishai were a subgroup of baatezu created by Tiamat.

Imps
Imps were relatively weak devils typically used as wizards' familiars.

Other Types
Alu-fiend • Archdevil • Cambion • Chain devil • Desert devil • Duergar • Gorechain devil • Hellcat • Hellfire engine • Infernal armor animus • Kalabon • Misfortune devil • Shocktroop devil • Succubus • Withering devil