Oshus is an old man who lives on Mercay Island in Phantom Hourglass. He is the adoptive grandfather of Ciela. He gives Link the Oshus's Sword after sneaking into the Storehouse and trains him in battle to use such techniques as the Jump Attack. After enough training, he allows Ciela to accompany Link on his journey to save Tetra, and pops up every once in a while to give Link some valuable information. Towards the end of the game, he reveals his true identity as the Ocean King.