Sometimes three shots will work, sometimes you get hit with flies and then you have to run down to the torch, so it's safer to stick with two.

Once you engage the colossus and get him to shoot his first fly swarm you should be able to walk to the right and get 2 arrows off before he shoots again.

If you stand right on the fog gate, the wall to the left sticks out a little, enough so that you can hide behind it and it completely protects you from the fly swarms he shoots at you.

As soon as you enter the fog gate you should be able to see Dirty Colossus in the distance.

As soon as you see him start charging, run or roll backwards a few times, wait for the attack to end, then run up behind him and start attacking again.

He then shoots this sphere of bugs outward, kind of like God's Wrath, and it will knock you back and do a good chunk of HP if you're close to him.

He will pull his arms in and almost curl up into a ball, and massive amounts of flies will buzz around him.Sometimes he will stop and charge up to do an area effect attack. Make sure to rotate when he swings, but his punches should never hit you as long as you stay behind him.

Light Weapon and Cursed Weapon are also very useful (just watch your HP with Cursed Weapon).Turpentine, Black Turpentine, or a Dragon weapon are highly recommended since the boss is weak to Fire damage. Just run behind him and start hacking away. The Dirty Colossus is really easy to kill with melee attacks.

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