Pw is the sp, mp, or mana for Fantasy earth zero. every skill or attack you use has a certain pw cost (although basic attack pw cost is 0). Usually the more powerful the skill, the more pw it requires, and often some skills have other requirements such as a certain weapon equipped or a certain status on your character. For example the move punishing strike for scouts requires daggers to be equipped as well as the hide status to be on the scout and 84 pw. Pw, or power, will naturally be recharged as you run around or stay still, as long as you do not use skills. Some potions or consumable items can be used to restore pw more quickly, and crouching also restores pw much quicker than normally waiting.