Gifted
It is a cruel and unjust reality of this world that Heaven and Earth do not play fair. They are biased, and the very concept of equality is shattered from the moment of birth.
Gifts are special abilities that some people in this world, who can wield mana, are born with. These people are called Gifted.
These abilities can manifest in various ways, such as enhancing weapon mastery or fortifying the body like an impenetrable armor.
A Gifted will always have a hidden ace up their sleeves to play in a battle; thus they'll always have the upper hand.
Of course, using mana, one can imitate many of the functions of the abilities that these so-called Gifted possess.
For example, one can strengthen their body using a spell, much like someone born with a body strengthening Gift.
However, here's the catch. Spells don't grow but Gifts do.