Assassin's Creed Valhalla - The Big Finish - The Builder Boss Fight - Walkthrough

You’ll notice by aiming at him that his weak spot is the top of his head. The best way to shoot his head is to wait until he launches you into the air. Also, he will occasinally drop a blue and white orb, pick it up to do increased damage to him. After you defeat him down to 50% health he will start phase 2 and attempt to trap you into a circle followed by 3 waves of ground attacks that will launch you into the air. Essentially, use what ever arrows you have left to shoot him in the head and run in circles around him until he drops more of the blue and white orb to attack him. Bringing him to his knees allowing for a few other attacks, then just rinse and repeat.