Willpower

Willpower is a powerful force that is possessed almost exclusively by Humans, and is a sort of counterpart to Magic.

Lore
Willpower is the ability to force the present and future to shift to your needs, usually in a subtle way.

By itself, it is incredibly unstable, and tends to dissipate quickly.

Trivia

 * Willpower Souls are represented by the color red. This is a leftover from early versions of TOGWITO