Zeus commands Athena to give Perseus her owl Bubo, but instead she orders Hephaestus to build a golden replica of Bubo, who leads Perseus, Andromeda, Ammon, Thallo and some soldiers to the Stygian Witches. By taking their magic eye, Perseus forces them to reveal that the only way to defeat the Kraken is by using the head of the gorgon Medusa, whose gaze can turn any living thing into stone, and who lives on an island in the River Styx at the edge of the Underworld. The next day, the group continues on their journey without Andromeda and Ammon, who return to Joppa.