Heaven Devouring Beasts are supreme-graded saint beasts, exceedingly rare in numbers.
Legends had it that a fully grown heaven devouring beast would smoothly enter the demon emperor realm with no fear of bottlenecks. At that time, they would even possess the ability to swallow the moon and stars. The legend also states that their appetite had no limits, even able to swallow the sky. These were one of the most supreme-graded saint beasts among the greater demon races.