Summarize the following:
Once the battle starts, go toward the water. Stay on your horse! Quadratus is slow and will not be able to catch you. Aim the bow at its front legs and wait for it to come closer. When it does, it will try to crush you with its front legs, and you will see some blue parts under its hooves. Shoot the blue part with your bow, and Quadratus will collapse. You can also make Quadratus fall by running behind it and shooting the blue parts of its feet when it tries to turn around to face you. Dismount from Agro, proceed to the fallen colossus, and climb up the furry part of its front legs. Keep climbing until you are able to stand on its back armor. Don’t forget to rest periodically when climbing. This will allow you to recover some of your stamina. Jump through the protruding parts of the armor to its head. Be sure to grab on to something to steady yourself, so you don’t fall down when Quadratus starts shaking. You will need a fully-charged sword to defeat Quadratus. Stab the magical weak point 3 times. The point will then disappear. At this point, Quadratus’s life will be drained approximately halfway. Once the magical weak point disappears, climb to the left shoulder and head toward Quadratus’s back. When you reach its tail, you will see another magical weak point. If you fall off Quadratus (this happens sometimes due to fatigue), shoot one of his hooves, and you’ll be able to climb back up again. Hold on to Quadratus’s fur and stab the weak point 3 times. Its Life bar will be depleted, and it will fall.

Summary:
Head northeast towards the water. Shoot Quadratus with your bow. Climb up Quadratus. Make your way to Quadratus’s head. Charge your sword. Stab the weak point. Climb over the left shoulder. Stab the second weak point.