Moving forward, open the red and the green chest and go left. You'll return later to the closed door which you have passed.
You're in the chamber with Soul of Hades. Essence your weapon with that and attack Satyrs to test it. First upgrade let you send waves of dark energy - it's very powerful and useful skill. Ashed enemies give you green orbs.
After getting through the gate, you run into a room with two Talos statues. They'll come into life.
Besides using hammer, Talos hit the ground to attack Kratos with three circles of flame. You should block this attack, not evade.
Another of Talos specializations are attacks from air, similar to those performed by small bats. he'll perform then when his body begins to burn. After a while he disappears and a circle appears underneath you. Run away from that.
Keep them at bay with your blades, block their hammer and avoid attacks from air. They can't be knocked up in the air, so you have to attack between their blows. When you defeat them, destroy coffins under walls - they give you lot of red orbs.
Then grab a bust from the right side of the chamber and drag it under the ladder nearby an entrance. Go onto a statue, jump at ladder and move up.
On left from ladder you find a Note from Castor the Prophet and a green chest. Move a bit left, jumping onto next platform and open the red chest. Further on you find closed door to which you'll return.
Going right, you'll pass a broken fountain with the green gas and go through open door to a round chamber - an elevator.
When you pull the lever, elevator takes you down. Leave the elevator and pick up red orbs passing tombs.
Moving forward, you get onto a balcony and in front of a corridor with spikes in the floor and two chandeliers.
Jump on the first chandelier and grab the snake head. When the green gas frees, you'll fall down. Jump onto a floor and run to the second chandelier. Make a double jump at the end of a footbridge to get onto this chandelier.
When the world returns to normal state, and you're high with chandelier pull the snake heads. When you fall down, jump right onto a footbridge and run to its end. From there jump toward a green point, grab it and press a button which will appear on the screen to destroy door and land safely.
Then, make few steps back and open chests for red orbs, Gorgon Eye and Phoenix Feather.
Moving forward you get into a chamber with green gas and two grilled passages. Use the gas, notice what's happening to the floor and when the time returns kill all birds. Use the gas once again and jump to the right grill - when it falls down, enter next room.
Pass the chamber with gas and go to the last room for chests.
Return to the chamber with gas and sniff it. Look at the floor again and wait for birds. Defeat them and use gas again. Then, run to the last one room (with chests) and go through previously grilled door.