Hit the button on the wall near where you go the Fire element to drop the platform. Enter the door to the Court of 1000 Warriors.

Ascend the stairs and open the double doors. Climb the next stairs. Go left (or right - doesn't matter) to the outside of the structure. Grab the goodies (get that Icon of the Defender!). Go around to the front of the structure and go up the stairs, all the way to the top. Step on the disk with the red dagger and watch it rotate. Turn around and notice that a platform has risen in the lava pool, along with a Stone of Summoning.

Also notice that a door has opened to the left of the lava pool.

Go through and follow the hall. Go left (or right - doesn't matter) at the Ring of Turning, down some stairs into a big chamber.

Go right through the unbarred door, down some stairs to a broken rope bridge. Drop off the bridge (like that's a problem...) and go through the passage to the right. Dive into the water and hit the switch ahead of you, removing the bars in the floor. Swim down the tunnel, collect the jade skull, and hit the second switch.

Swim back up and notice that the second switch opened a second exit above. Swim up through it. Follow the corridor all the way back, past the Staff of the Ovimancer, to the start of the broken rope bridge. If you want, jump across the bridge to score some goodies (Tome of Power, Mystic Urn, etc.).

Retrace your steps back to the door leading to The Plaza of the Sun. Enter.

Hit the button to activate the lift. Go up and retrace your steps to the 2nd door that opened with the ornate stone key. Note the sign that reads: "Those who desecrate the Stream of Life shall be punished with death." Follow the hall to the door leading to The Square of the Stream. Make sure you hop over that Stream! Enter the door.

Go down into the yard with 4 exits, one on each side.

Go through the passage on the right and follow the hall to a well. Prove your worth by swimming down the well, through a maze, and up to the surface on the other end. Go into the room and collect the Water element.

Grabbing the Water element will cause a passage to open behind you. Go through it and follow the hall back to the yard with 4 exits. Go straight across to the exit that is now unbarred.

Come to a large room with an obelisk with a Mystic Urn on top. Grab all your goodies then exit the room through a passage under the stairs where you first came in.

Follow the hall to another big room. Go around the perimeter of the pool and step on the floor plate in the back, raising a platform in the middle of the pool. Grab the serpent's heart from the platform.

Retrace your steps, but just before returning to the room with the obelisk, take the narrow staircase on your left, returning you to the lawn with 4 exits.

Go up the stairs opposite you to a room with a Tome of Power and altar in front of a small pool. Walk up to the altar and put the serpent heart on it. Grab the crystal skull.

Retrace your steps to the lawn with 4 exits. Take the stairs opposite you back to the door leading to The Plaza of the Sun. Enter.