The defender and destroyer of Thangorodrim, the mighty "Rushing-jaws" was the greatest monster ever born in Middle-earth. He was the epitome of Fire-drakes and the father of Winged Worms. Hundreds of feet long and possessing a fiery breath capable of destroying an entire forest in a single blast, Ancalagon could drive away an army or slay hundreds of troops unaided. His spells equal those of the Maiar and his visage invoked a terror rivalling that of a Balrog.
Ancalagon was a beast unrivalled by any in the annals of history. Ancalagon was so huge that, when he fell, he shattered the towers of Black Enemy's fortress beyond repair.
- MERP:Creatures of Middle-Earth
- MERP:Middle-Earth Adventure Guidebook II