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Shortly thereafter, Hades successfully wielded his new mighty weapon during the subsequent 11-year-long war with his father Kronos and the other Titans. The helm instantly made him invisible and generated such ineffable terror, that it scared his brothers Zeus and Poseidon to the point that both of them paled and started to sweat with fear, greatly satisfying Hades. Together with his brothers Steropes and Arges, Brontes forged three incredibly powerful weapons, the third of which was the Helm of Darkness, which was given to Hades. Zeus managed to talk to the Cyclopes Brontes and convinced him to forge powerful weapons for him and his siblings (which would be more powerful than Kronos' Scythe) behind Kampê's back. However, the gods overcame their fear and were able to sneak in. Their guardian, Kampê, was the most ferocious and fearsome monster in all of Tartarus, and even Zeus, Poseidon, and Hades initially shuddered with horror when they saw the infernal monster for the first time.
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All six of them were imprisoned in the maximum-security zone of Tartarus, surrounded by huge bronze walls, and a lava moat guarded by fierce demons. Zeus' eldest brother, Hades, was very skilled in navigating under the earth and was able to lead all of his siblings into Tartarus, with the intention of freeing the Elder Cyclopes (Arges, Brontes, and Steropes) and Hekatonkheires ( Cottus, Gyges, and Briares). Percy Jackson's Greek Gods Forging the Helm of Darkness
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