The Skull Tower Idol is an item from The Legend of Zelda: The Wind Waker. It is one of the items in the quest for the Shop Guru Statue. If Link trades the Traveling Merchant on the Greatfish Isle a Fountain Idol, he will receive the Skull Tower Idol. It can be traded to the merchant on Bomb Island and Greatfish Isle for a Fountain Idol or traded with the merchant on the Mother & Child Isles for a Big Sale Flag. Interestingly, unlike the other trading items in the Quest for the Shop Guru Statue, the Skull Tower Idol is not needed to finish the quest.