Hades, so that he can travel unseen in the overworld. For a time, though, he lent his cap to Perseus, who used it to escape from Medusa's sisters after he killed her.
Antima, the cap of invisibility.
A invisibility cap
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Hades had an invisibility cap, or helmet.
He is renown for his helm of invisibility.
One symbol for Hades is Cerberus, the three headed dog that guarded the gates of Hades to prevent the dead, who enter on the river Styx, from leaving. Another object that is associated with Hades is the Cap of Invisibility, also referred to as the Helm of Darkness or the Helm/Cap of Hades. The Cap of Invisibility was given to Hades by the Cyclops. They gave it to him as the gave Zeus his thunderbolts and Poseidon his trident. As the trident is Poseidon's main symbol and thunderbolts are Zeus's, the Cap of Invisibility could be considered Hades's main symbol. The Cap of Invisibility allows the wearer to be invisible to any supernatural beings. The cap has a pair of wings on it, attached to each side of the cap.
It was a cap that made the wearer invisible. It was owned by Hades but worn occasionally by Athena, Hermes, and the hero Perseus
Nico asked Percy to promise to use Annabeth's invisibility cap for emergencies because he wanted to ensure it was used responsibly and not for frivolous purposes. Nico knows the value and power of the cap and wanted Percy to respect its capabilities.
The invisibility cloak
The Invisibility Cap is Hades's special "weapon," just like Zeus's is his thunderbolts and Poseidon's is his trident.
In Greek mythology, the concept of invisibility is tied to deities or objects that possess magical powers to render themselves unseen. For example, Hades' helmet of invisibility allowed him to move unseen in the underworld. Invisibility is often associated with stealth, deception, and the ability to move undetected.
a hat rack