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Forgotten Realms Wiki has an article about: Pit fiend

"Cloaked in fire and as tall as two humans, this hulking monster spreads its batlike wings and cracks its whiplike tail. Great scales cover its body like armor. It smiles, revealing large fangs that drip with a hissing venom."

Pit Fiends are the lord of devils, with great strength and deadly power. They are among the highest ranking, second only to the archdevils.