The Mystic

Your POWER abilities gain 0.3% / 0.5% / 0.8% / 1.2% increased power for every 3% Spirit you have, up to 50% Spirit.

Where each number in the text above comes from, in the order the text spends them. A coefficient is multiplied by the attribute it names; a band is the width the roll lands in, so the printed range is the mean less and plus half of it.