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Classes, a powerful tool given by the System of Genesis to any mortal with humanoid physique and psyche, or a powerful monster who had accumulated human-like knowledge and had acquired the psyche of a humanoid, even while retaining the body of a beast, such as the wolves of my Empire like Wagyu, Kekensha and the rest.
Most people can acquire two classes at a time, the Main Class, which is usually related to fighting, strength, and so on, and the Sub Class, which are related to the creation, crafting, arts, and more. It seems that those that are purely fighting-oriented would never 'awaken' their subclass option unless they begin developing skills in those categories.
