Code:
Game_BattlerBase.prototype.paySkillCost = function(skill) { this._tp -= this.skillTpCost(skill); if (this instanceof Game_Actor && $dataClasses[this.currentClass].note.match(/<\s*reverse\s*>/im)) { this._hp -= this.skillMpCost(skill); } else { this._mp -= this.skillMpCost(skill); } };