The Helm of Darkness is a mythical artifact from ancient Greek mythology, often associated with the god of the underworld, Hades. This helmet grants its wearer the power of invisibility, allowing them to move unseen among mortals and gods alike. It is sometimes referred to as the Cap of Invisibility and is a symbol of stealth and secrecy. In various myths, the Helm of Darkness plays a crucial role in the adventures of heroes like Perseus, who used it to evade enemies while on his quest to slay the monster Medusa. The helm is also linked to the broader themes of life, death, and the unseen forces that govern the world.