The Cave of Torment
Climb down onto the roof of the building you shoved into the river and jump from there to the handholds on the far side. Break the tree that blocks your path and jump over to the far side from there. Ignore the big grinding wheel in your path, and head up and over the path nearby. Speak to the argonaut on the ground to learn about the Golden Fleece, which Jason possesses.
There's a new Medusa in the area, with a powerful petrifying beam that will turn you to stone before you can roll away from it. You can attack her as you normally would, but again, don't jump around. You'll deal with more of them in a few minutes.
After looking around and finding the Phoenix Feather here, pick up the argonaut and place him in the middle of the hallway, on the rolling path that leads under a grinder. His body will clog up the works and allow you to move into the room nearby, where another Cerberus awaits you.
Boss Fight: Cerberus II
This cerberus is a bit different than the one you fought earlier: it's tougher, for one thing, and can breathe fire and shoot fireballs. Luckily for you, though, you can block pretty much all of its attacks, except for the fireballs, which will eventually break through your block and damage you. Still, though, if you're patient, you should be able to beat the creature without taking too much damage.
This is technically more of a miniboss fight, so there's not much indication of progress here; there's one animation that plays when you knock off around a quarter of the beast's health, but apart from that, you'll just have to use normal weapon attacks on the animal until you get the O-prompt above its head.
Video Walk-through
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Ignore the switch on one side of the room here; it won't help you. Instead, let the beast get close to you and keep your guard up. When you block a couple of its attacks, hit it two or three times with your Blades of Medusa. That's basically the pattern that you're going to be following here, making the fight a relatively long one. No need to bust out any supercombos, which will likely just open you up to damage anyway. Feel free to use your Rage of the Titans, however, and use that to knock most of the beast's health away; you'll be getting a full health recharge when it dies, anyway, so you don't need to worry too much about taking damage so long as you leave yourself a comfort zone for finishing the fight.
When the O-prompt pops up, hit it to finish off the devil dog and grab the Golden Fleece.
Escape!
With the Fleece in your possession, flip the switch in the room, head to the scorch mark in the center of the room, and tap L1 just before it hits you to reflect the fireball back at the wall; this is the special power of the Golden Fleece, which will let you do this on most incoming enemy attacks from now on.
For instance, the medusas that attacked you earlier are back in full force now, with two attacking you at a time. They're tough to take on normally, but with two, you'll need something special to deal with them. The Golden Fleece will let you tap L1 just as their eyes start to glow green; if you then hit the button prompt that appears (it's randomized), you'll petrify any nearby enemies, allowing you to attack them and hopefully crush them to death before they unfreeze. Again, no jumping attacks; if you get frozen in midair, you'll die upon landing.
Into The Temple of Euryale
Head back to the entrance to the temple, near where the skeletons originally attacked you. If you walk onto the platform nearby, you can use the golden fleece to block the stone beams and reflect them back on the doorway, which in turn will let you attack it and head inside.
Inside, start making your way through the frozen enemies, smashing them before they can come to life. Climb down the ladder to reach a large abattoir with new minotaur-like enemies. You can throw the lesser soldiers at them, if you like, or just use some upgraded Cronos' Rage spells to knock a bunch of them out at once.
;)
Nearby, you'll come across a still-human soldier that wrecks a lift, seemingly preventing you from moving on. Don't worry about it, though; take the working lift down into the transfer room, then kill the bugs that are flying around. When they're dead, you can smash the giant emblem on the wall here to reveal some treasure chests, including either a Gorgon Eye or a Phoenix Feather. (You may have to throw one of the bugs at the emblem in order to smash it.) Get back on the working lift and raise it up slightly off the ground; note that the height of the non-working lift is affected as well. What you want to do is raise the nonworking lift just high enough for you to jump up onto it, without it being too high to reach. When you do so, you'll be able to jump up onto some footholds in the shaft and climb your way up to the top from those.
A fairly tough supersoldier will fight you here. It's immune to throws and will block many of your attacks. If you can pull it off, the parry attack (hit L1 just before an attack comes your way, then tap O) will be a good way for you to bust through its defenses. You have a health chest near the save point here, though, so feel free to toy around with it and find a strategy you prefer.
Challenges
When you climb to the top of the ladder here, you'll need to climb up the wall and avoid the ceiling blades that rotate around up there. They move slow, and there's another health chest at the end of this section, so don't worry too much if you get hit once or twice.
When you drop down to the health chest, you'll find a switch. Flip it, then quickly run down the hallway nearby until you find another switch. Flip that one as well, then move to the end of the hallway and lift up the door there with the R1 button. You need to do all of this before the spiketrap comes back and kills you, but you should have just enough time to do so if you act quickly.
