Starting immediately after the fight with Hercules, swim up to the floating corpse (taking a moment to appreciate just how nasty it is) and dive straight down.
Nose around the murky water at the bottom of the shaft, and Hercules’ Shoulder Guard is yours.
Turn this on after beating the game, and the damage you take will be cut by a third.
After you swim through the underwater tunnel and surface inside Poseidon’s Chamber proper, your natural inclination will be to run forward and explore it.
Before you do that, though, jump out and run toward the camera. Just a few yards down, behind a set of bars, is the seventh Minotaur Horn.
Once you’ve freed the Poseidon Princess, she’ll flee and then almost immediately start shrieking for help. Don’t worry about her – she’ll be fine. While she’s pleading, take a moment to explore the room she was in.
Run over to the right, and in a slightly hidden alcove, you’ll find a chest with the 10th Gorgon Eye.
Turn this on after you’ve beaten the game, and it’ll ensure that your magic meter never runs out.
Once you’re inside, turn right and flash Helios’ head. A chest with the ninth Phoenix Feather (and your next magic upgrade) should magically appear.
Getting as close to the corner as you can, do a double-jump, immediately deploy your wings and glide to the right.
If you did everything right, you should land in the (very dark) area behind Aphrodite’s bed. Use Helios if you need to see (and be careful not to fall off the edges), although the glint on Aphrodite’s Garter should be more than enough to tell you where it is.
Turn Aphrodite’s Garter on after beating the game, and you’ll be able to use the Blades of Athena again, just like you do in God of War III’s opening battle.
Next page: Tartarus and Daedalus’ Workshop