As anyone would expect, the Ancient Beast Mountain Range has an overabundance of beasts. However, what's kept from the general public is that the variety of beasts inside the mountains is more than they can comprehend.
Beasts are often categorized and separated by bloodline, species, and subspecies. Strength also plays a significant role in the hierarchy, but one's bloodline grade is equally as important as that determines a beast's potential.
Bloodline grades for beasts in the Mortal Realm are slightly different, but overall the same as the grading system for weapons, techniques, pills, etc. They go as follows:
Common Grade: Rank 1 Potential (Equivalent to the Body Tempering Realm). Beasts with this bloodline grade are the lowest of the low. They don't have any special bloodline, as living is the minimum requirement for most beasts to evolve into a Magical Beast and reach Rank 1.