Does Hercules help you on mythology island?
Hercules will not help you get the 5 sacred items.
You have to get all 5 items and return to the Tree of Immortality to see Athena. When you have deciphered the hidden message, Zeus seizes the items from you. Now Hercules will help you reach the thrones of Poseidon and Hades. But you need the Touchscreen Mirror from Aphrodite's test in Poseidon's realm.