You have to play a game. You have to recognize the gods and goddesses.
Aphrodite
past Hades castle on the beach above Poseidon's castle in the water where Aphrodite will be near the life guard tower.
AresHermesAphroditeArtemisHestiaApollo
AresHermesAphroditeArtemisHestiaApollo
With Aphrodite's magic mirror.
AresHermesAphroditeArtemisHestiaApollo
Aphrodite.
1) It's 'Hydra'. 2) You have to go to the beach, where Aphrodite is. Then, dive into the water and get past the maze into a sort of cave. There, you need to defeat the Hydra to get the scale.
Use the mirror Aphrodite gave you.
Aphrodite.
Pass Aphrodite's test.
Ares