If you mean Ahriman, you can find it here

http://www.mahalo.com/Prince_of_Persia_Xbox_360_Walkthrough#Boss_Fight:_Ahriman
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See what I just said in your concubine question. The same strategy applies. On top of that, you only use your sword more with her father. When Ahriman appears, you have to move around the landscape just like before, but here, the black lava (the corruption) will rise. When you see that this is happening, you have to move immediately to the protected circles, along with Elika. You will have to get to three plates so that Elika heals them, and this way you have beaten the final boss.
Source(s):
3 days of playing and ending Prince of Persia

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When he attacks, deflect and then counter. Use any combo that starts with an Acrobatic attack (X or A) and you'll switch places with him. Immediately follow up with normal attacks and it will start a ring-out mini-game. Elika will stop the Warrior from stomping on you with her magic, and thus will begin a small tug of war game. As the Prince gives her support, tap Square repeatedly to throw him out.
Source(s):
http://www.gamefaqs.com/console/xbox360/file/945943/55032

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