The Helm of Darkness

The Helm of Darkness
The Helm of Darkness is Hades main weapon. It not only has the ability to turn invisible but also can turn to darkness. In The Lightning Thief, it is stolen by Luke and is given to Ares. The reason why Hades weapon is not that good is because if he had a good weapon, it would undo the balance of the Big Three's power. Zeus has the Master Bolt. Poseidon has the Trident. And poor little Hades gets a the Helm of Darkness.