Chantelise/YMMV


 * Game Breaker: The Darkness Crystal restores your HP with a charged strike, and you can move while charging your attack, making survival a cinch. You get it in the last area, though, so there aren't many opportunities to take advantage of it within the story.
 * The Super Armor spell likely qualifies as well. It drastically reduces incoming damage, prevents you from being knocked down, which in turn prvents you from losing your Charge Attack such as the healing one mentioned above, and you can use it pretty quickly into the game. You're going to need to abuse this if you want to get through the game.
 * Woolseyism: CarpeFulgur's localization philosophy is somewhat based on this.