High concentration of mana and will power? Listening to snow he had a hint on what she meant. Beings with high concentration of will power are literally termed strong. Not only have they harnessed mana than regular people but also implemented it in any way possible.
To enhance their physique, project far more lethal skills and attack, fortify the mind. The list goes on and on..
At first he'd just thought mana was the energy used by humans to activate skills but he was wrong. It didn't just serve as a mere form of energy but much more. Being around for as far long as ages it served as the very core of a planet's existence.
[as you know mana is energy and energy can be implemented in various way. But it's speculated that beings who've harnessed mana into a purer state can utilize pure mana.]
Utilize.. you mean use it raw?