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The helmet, though retaining influence from the classic Corinithian helm of antiquity, was leaner and had a more predatory look to it. The improved rebreather and filtration system allowed for a narrower 'chin' than the Erebus pattern did.
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Improvement in materials and mithril exploitation meant thicker plates of armour were, curiously, lighter giving the aegis a bulkier outline and more imposing appearance overall.
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It is said that the helmet was designed with terror in mind, as the insideous Council had made appearances and, it was feared, war was immanent so a truly war-like aspect was needed.
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It would be centuries, though, until Keres Aegis was tested in battle, after all but few Kalshodar had abandoned Gaia althogether.
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Unfortunately, it failed the test.