Shadow of the Colossus/Dirge - Colossus 10

Dirge lies waiting under the sand in this cave. His design is similar to the electric eel you fought earlier, but defeating him is much different. Like the last battle, Agro is essential to victory, so don't get off him unless told to do so.

Once Dirge awakens, lock your vision onto him and ride Agro around the sandy arena. He'll begin chasing you right away. Equip the bow and let the hero turn around to aim at the colossus (when locked on he'll turn automatically). Dirge will lift his head out of the sand and eventually open his eyes. Take over control of the aim once the eyes appear and fire an arrow at one of them. This isn't easy - it requires a good aim since yor foe's face does move quite a bit whilst pursuing you. Dirge will cry out once you hit, and dive underground.

Keep an eye on him until he finally crashes into a wall and starts writhing around, then ride Agro towards his back and climb up. This colossus has two weakpoints along his back, with the second located a little higher up. No matter which one you choose to tackle, he'll usually remain stunned long enough for you to finish off that symbol before burrowing again. When he does, simply jump off, mount Agro, and repeat the process a second (and final) time.


 * Note: This boss is no different on Normal or Hard Modes