Which mythological figure is credited with creating the first effective 'product teaser campaign' by hiding their creation until a dramatic public reveal?

Throughout mythology and folklore, gods and mythical beings have introduced powerful items to humanity - from Prometheus' gift of fire to Thor's mighty Mjölnir. These divine 'product launches' shaped civilizations and inspired countless stories. Test your knowledge of how these mythological products were introduced to their markets (mortals and immortals alike) and what launch strategies were employed by the gods!

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Hephaestus with Pandora, crafting her in secret before presenting her to Zeus as the perfect gift for humanity
Odin with the eight-legged horse Sleipnir, breeding it privately before showcasing its speed at a divine race
Athena with the olive tree, growing it overnight during her competition with Poseidon for Athens' patronage
Wayland the Smith with his magical sword, forging it in darkness for 100 nights before revealing it to the Norse kings