There's a few pieces of information that only few Awakened knew.
The existence of beast classification was one of them.
Nothing could have prepared humans for the arrival of the Primordial Expanse. Society had practically collapsed when it first came about.
But it was the arrival of Awakened that settled everything and brought order back to the Federation.
However in the Primordial Expanse, things were a little different.
Alongside the conventional F, E, D etc. ranking system, there was another set of classification for beasts.
Within each rank, each beast had another classification.
In ascending order, it goes from:
Ordinary Beasts
Mutant Beasts
Variant Beasts
King Beasts
Ancient Beasts
Divine Beasts
The rank of a beast didn't matter when the classification of beasts was considered.
There could be an F rank Divine beast, or there could be S rank Ordinary beasts.