Aura.
A Power that is hidden deep inside living beings.
It was hidden inside every living organism, however, the usage of this power was not so common among all living organisms.
The reason?
Mana.
Mana had already become a fundamental part of the life of a majority of species, It was easier to control and in certain cases stronger than aura.
If aura was the power of the being itself.
Mana was the power of the universe.
And the power of a single organism couldn't match the power of the Entire Universe.
Mana could say to be more powerful than Aura in most cases.
But it did not mean Aura was weak.
If it was, Then the Orcs would be a lesser race and not a major race in the Alliance that stood toe to toe with the Elves, Who were masters of Mana.
If the Usage of Mana was to reinforce your body from the Outside to enhance one's strength temporarily, Then Aura Could enhance the strength of the user in all aspects....permanently.
