Wendonai

Wendonai was one of the six original Type VI Demons, or Tanar'ri, from the first edition Advanced Dungeons & Dragons Monster Manual and Dungeon Masters Guide. Originally there were only six known to exist. The other five were Alzoll, Ter-Soth, Ndulu, Errtu and the greatest of them all was named Balor.

In the original D&D pamphlets this breed of demon was known as "Balrog", but the name was revised in subsequent supplements to simply "Type VI Demon" so as not to infringe on Tolkien's copyright. Later the name "Type VI Demon" was itself revised to "Balor" taking the name of the greatest individual of their rank as the name for the entire breed.

Wendonai is detailed in Lost Empires of Faerun, pages 52 & 54-55.