The Helm of Hades which made him invisible was made from...
skin of dog
volcanic glass
hooves of pegasus
human bones
In classical mythology, the Cap of Invisibility (lit. dog-skin of Hades) is a helmet or cap that can turn the wearer invisible. The Cap of Invisibility enables the user to become invisible to other supernatural entities, functioning much like the cloud of mist that the gods surround themselves in to become undetectable.
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skin of dog
volcanic glass
hooves of pegasus
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