Prince of Persia: The Forgotten Sands Walkthrough 14 - The Throne Room

Run along the left wall onto the concrete arcade. From there, jump onto the next one on the other side of the chamber.
Get to the fissure and go right towards the flag. Afterwards you will have to jump onto a column and from it onto another one
From the columns, jump onto the rocks and climb up. The first phase of the fight with Ratash requires you to stand right next to him and dodge his attacks by rolling between his legs. As he attacks, roll behind him and use the Power Attack on his calf.
The Throne Room - Boss fight
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After a few times his health will fall and Ratash will kneel down. Quickly approach him from the front, press the jump button and once Prince's sword shines - the attack button. You need to get away from Ratash only during his stomp attack. Just roll or jump away so that the wave doesn't hit you. After such an attack, immediately get back under Ratash's feet.
Once Ratash jumps away, quickly go up the stones and jump to the platform where he is using the poles.
Once he jumps way again, once more quickly get to him by using, inter alia, the water streams. You will eventually fall down onto the arena. Fight off the sand enemies and use the same tactic on Ratash as before.
At some point Malik will stab Ratash with a sword [Trophy - Not what it looks like]. After the scene, go into the new corridor. If you didn't let the enemy hit you throughout the whole fight, you will receive the [Trophy - Untouchable].
Run through the spiked traps without stopping and enter the portal leading to Razia, who will grant you with the Flight ability.

You will have the chance to use you new power right after getting out of the portal. Get onto the plank. Jump into the pit in front of you, pressing the Flight button at the same time and you will immediately fly towards the enemies on the other side. The presence of an enemy is the requirement for using Flight. Do the same in the further part of the corridor. From now on you can start working on another trophy [Trophy - This is Persia!]. Instead of fighting normally, knock your enemies into pits. You will receive the reward after killing 20 of them.