Will Power (WP) is a measure of mental and magical resistance and general magical awareness. It reflects a creature's ability to shrug off the effects of magic, charms, and mental influence.
Magic-using characters will benefit from a high WP, especially if they are to confront some of the hellish creatures of other worlds, which may attempt to infiltrate their minds and distort their personalities.
WP is expressed as a percentage of 01-100%.
For tests, WP is a broad measure of a character's strength of character and mental resolve. It is used in tests to determine resistance to magic, hypnotism, torture, and similar situations.