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It seems that the 'Uroboros' Skill strengthened the 'Uroboros' effect inside the blessing of the System Master.
By going on the explanation of Classes by the gods, Classes are a way for the system to unlock someone's soul inner potential in a certain field…
Like for example, someone that practiced magic but can't get to learn it, then manages to level up and change Class to Apprentice Mage as it showed the talent, and the Class would give it the push necessary to finally learn the Magic Attribute into a Skill.
So, in other words, this 'Uroboros' Skill most likely awakened the inner potential of my powers and my evolved Devour. But there are so many Classes left, it seems that there might be more ways to awaken my inner potential.
No matter how strong I might seem to others, there is still a lot of room to grow, and by gathering skills and more divinities, this potential becomes wider.
Check "The Protagonist's Sister Is Actually the Strongest"!