Which mythological 'product development' strategy did Norse craftsmen use to create Thor's hammer Mjölnir, resulting in its unique appearance?

Throughout mythology and folklore, certain divine artifacts and magical objects became iconic 'products' that defined their owners and captured human imagination. Behind these legendary items lie fascinating stories of creation, promotion, and consumer appeal that mirror modern product development principles. Test your knowledge about how mythological products were developed, marketed, and gained their legendary status across different cultures!

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They deliberately designed it with a short handle after Loki interfered with the forging process
They added dragon scales to the metal to make it lighter and more aerodynamic
They forged it from a fallen meteor during a specific planetary alignment
They embedded fragments of Yggdrasil wood to connect it to all nine realms