Demon

Demons are chaotic evil fiends from the Abyss dreamed into being by Tharizdun, the Chained Oblivion.

Demon lords

Leaders of various levels of the Abyss are known as demon lords and a few of these are called Demon Princes.
Demon lords approach close enough to divinity that they cannot cross the Divine Gate on their own, though sufficient mortal magic can summon them.