I would use it to invisibly pass by the palace guards.
To slay Medusa.
Cerberus, helmet of invisibility
His Helmet of Invisibility.
Hades had an invisibility cap, or helmet.
Hades, he was a helmet of invisibility.
A helmet of invisibility - From Hades Winged sandals - From Hermes Wisdom - From Athena
It was feathered shoes, Bright shield, Helmet of invisibility.
Zeus' lightning bolt, Poseidon's trident and Hades' invisibility helmet.
It depends on the God. --- Zeus had thunderbolts; Poseidon had his trident; Hades had a helmet of invisibility Aries used any weapon Eros used a bow and arrows.
The helmet of invisibility, metals, or jewels. Sometimes, mortals would sacrifice black sheep to Hades.
Zeus' lighting and thunder bolts, Poseidon's trident, and Hades helmet of invisibility.
Hades had a "cap of invisibility." The Helm of Hades made the wearer invisible to both gods and mortals.