Which mythological artifact was redesigned multiple times after customer feedback revealed its original flaw of turning users to stone when they looked directly at it?

Throughout history, powerful mythological objects have captivated human imagination. But what if these legendary artifacts were modern products? This trivia explores how ancient mythological items might have been marketed, designed, and branded in today's world. From divine weapons to magical talismans, these items represent some of the earliest examples of 'product design' that solved user problems and delivered unique value propositions—albeit with a supernatural twist!

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Perseus's shield (mirror shield designed specifically to view Medusa indirectly)
Thor's hammer Mjölnir (added the short handle after usability testing)
Achilles's armor (redesigned to protect the heel after fatal user experience)
The Golden Fleece (added non-reflective coating to prevent blinding brightness)