Dampen

public SkillDampen(Heroes plugin){
  super(plugin,"Dampen");
  setDescription("Makes you invulnerable to opponents with < $1 mana. M:$2");
  setArgumentRange(0,0);
  setTypes(SkillType.MANA,SkillType.COUNTER);
  Bukkit.getServer().getPluginManager().registerEvents(new EntityDamageListener(this),plugin);
}