Answer: Perseus stole their tooth and eye and says he will give it back when they tell him where the nymphs are
Explanation: Perseus was the slayer of the Gorgon Medusa and the rescuer of Andromeda from a sea monster. As an infant he was cast into the sea in a chest with his mother by Acrisius, to whom it had been prophesied that he would be killed by his grandson. After Perseus had grown up on the island of Seriphus, where the chest had grounded, King Polydectes of Seriphus, who desired Danaë, tricked Perseus into promising to obtain the head of Medusa.
The Phorcides in greek mythology were three (3) old sisters who have one eye and one tooth between 3 of them. They told Perseus where to find the nymphs from where he got objects which aided him in beheading Medusa.
This act by Perseus indicates he was willing to go to any lengths to get what he was after.