In the last level you fight will Ares, The God Of War. He is very difficult to defeat. Using the Sword Of Athens is recommended. First, shield bash him a few times then hit him with your swords. He will then throw you, but this does not do damage. He will then split in three so you have three Ares to deal with. The cloned ones will die in a few hits. He will usually bring dead soldiers around you to life next. Kill them quickly, because Ares will attack you while you deal with the soldiers. There is also only a certain time when you can use the God given power. He will shoot fire from his sword and it follows you everywhere. Get close to him and hit R2 + X. This will do the most damage.