Third Room
When you reach the third room, raise the third lever, then jump into the water and use your swimdash to bust through one of the fragile gates underneath; that'll lead to the fourth room. The fourth post is obviously here (take note of the hidden alcove above this room as you raise it), as well as a switch in a small alcove; flipping it will open the gate above the room, which is where you ultimately want to be. It's to be found in the hallway nearby, to the right of the ladder. Head into the room there and prepare for battle.
Truth be told, this fight is only as hard as you want it to be. As soon as you start rotating the lever underneath the fate statue, a horde of enemies will begin popping up, including a large gladiator and numerous smaller soldiers. The soldiers will be capable of flinging fireballs at you (which you can reflect with the Golden Fleece) and also crawling towards you and exploding when they're near death. The gladiators and just beat-down machines. Since you have the ability to stop time, you can do so as often as you like to either grapple the soldiers to death or beat down the gladiators.
Making The Jumps
After killing everyone here, move out into the hallway and climb the ladder. There are two red orb chests here, as well as a pressure plate that you should stand on. When you have all of those done, return to the gladiator arena and rotate the lever underneath the statue; that will raise up the post here. Unlike the others, though, this one will slowly rotate back down into the ground, leaving you limited time to get past the grapple point above.
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As soon as you lock the post as far as it'll go, activate your Amulet and run towards the ladder. When you reach the top, wait for your timestop to wear off, then activate the Amulet again. At this point, grab onto the grappling point in front of you, then start rotating and jumping from point to point. You'll want to be around 45 degrees away from a full rotation before attempting to jump to the next point. A little practice will show you the way, and if you need to start over, the ladder you unlocked will let you do so.
Note that there's a hidden alcove on the right side of your screen as you rotate around the fifth and final post. Jumping to it will net you more red orbs and a Phoenix Feather.
Catacombs of the Fallen
When you reach the elevator, flip the switch and start dealing with the dogs that unceremoniously drop in your lap. If you've upgraded your Blades of Athena a fair amount, you should have the Cyclone of Chaos move bound to L1 + Square, which will make quick work of the doggies. When you reach the top of the shaft, tap O repeatedly to push the elevator back down a bit, kill a couple more dogs, then repeat the process until the doorway here is open wide enough for you to roll through.
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After making your way onto the wooden beams here, jump up onto the handhold to your right and creep along. Predictably enough, the stone pile in front of you is another stone golem. Take it out the way you did before, rolling away from it when it rotates, then rolling back in to hit it. Note that there's a dual mana/health chest back a bit, though; if you're already full on both resources, feel free to use your magic to drain most of the creature's health. The imps here will attempt to divebomb you with firebombs; get used to jumping just before they hit the ground to avoid the damage.
After swinging across the gap, be ready for a group of skeletons that will rise from the dead behind you. Use the Barbarian Hammer’s triangle attack to mash them, then kill them with the O-button to gain a few extra orbs. Head up the stairs and flip the switch to return to the Atrium of the Fates.
Before you move on from here, head to the left of your screen and enter the Bog of the Forgotten. If you return to the area where the Barbarian King grabbed you with his horse, you can find a Gorgon Eye and a chest containing around 4,500 red orbs. Nice!
Across The Cliffs
Return to the Atrium and use the Fleece to counter the fireball in the hallway nearby. That will lead to a passageway towards a cliff area where more skeletons appear. Blast the nearby skeleton archers with magic or combos, then bring the skeletal gladiator back into the hallway to take him out without having to deal with the more distant archers, who can then be destroyed with your bow.
When you’re ready to move on, swing across the first gap, but don’t keep jumping; land on the first platform and climb up the wall to find a Gorgon Eye and a red orb chest. Grab those items, then drop back down and swing along the grappling points.
