/**
  * Takes in Hero Class as a parameter. Change current player's current HP
  *
  * @param hero
  */
 @Override
 public void triggerEffect(Hero hero) {
   int duration = this.getDuration();
   if (duration > 0) {
     int curHP = hero.getCurrentHP();
     hero.setCurrentHP(curHP + this.getChange());
     if (curHP <= 0) {
       hero.makeGhost();
     }
     this.setDuration(--duration);
   }
 }