Forced Magic Activation.
It was the a forbidden technique among Mages, but for some… it could be considered something of a trump card—albeit a temporary one.
Once a Mage's Mana was depleted, they could never use Magic no matter how hard they tried. The Spell just wouldn't activate regardless of the means.
However, Forced Magic Activation bypassed this by inducing one critical element into the mix.
—Sacrifice.
Just as there was a way for Martial Artists to exponentially increase their abilities by sacrificing their Life Force to grow stronger, Mages could also let go of something incredibly important to attain a temporary burst of power.
They would have to let go of Mana itself.
Despite what was displayed by the system, every Mage—no, perhaps every human, really—had a secret stockpile of Mana within them.