Energy sword (fiction) - Halopedia, the Halo wiki

Energy swords, sometimes known as plasma swords, are a class of single-handed, double-bladed energy weapons developed by the Sangheili. To their users, they are formally designated as fireblades, and nicknamed plasma blades. The Office of Naval Intelligence has typically type-classified encountered energy

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Energy sword (fiction) - Halopedia, the Halo wiki

If the energy sword in Halo was made of metal instead of plasma

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Energy sword (fiction) - Halopedia, the Halo wiki

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