The Ten Ancient Fiends refer to the ten supreme beings of the demon world in the ancient era.
These ten fiends were all at the Emperor level and were legendary figures of the ancient times. As for who was stronger and who was weaker among them, no definitive conclusion had ever been reached because, although they all belonged to the ancient era, they did not exist during the same period.
Among them, the Heaven-Swallowing Beast appeared the earliest, emerging in the early ancient period.
Chapter 1425