Put your bow away and have Magnesis ready. The last phase has his blue shield appear permanently, but don’t worry. Beat him up until he pops up and rinse and repeat as necessary until the last phase. He will fly forward and land in the ground in front of you. When one one is above his head, shoot him. Keep your bow aimed at Master Kohga and wait for the rocks to start rotating around him. He’ll summon two rocks at his sides this time, but don’t shoot him immediately. The second phase sees Master Kohga float above a bottomless pit. Rinse and repeat until about half of his health is gone and he starts his second phase. Run up and do as much damage as you can before he pops back up. Shoot him in the face and the rock will fall on his head doing massive damage and embedding him in the ground. Just aim your bow and wait for him to summon a rock above his head, at which point the shield he put up will disappear. The first phase will show him put up a blue forcefield in front of him, just ignore it. The fight with Master Kohga has three phases. Also, the only Rune power usable during the fight is Magnesis, but that will be only for the end. All you need is a few arrows and a couple of melee weapons and this will be simple. Master Kohga himself is also quite powerful if you let him hit you, but he’s actually really easy to beat once you know what you’re doing, and is quite possibly the easiest boss encounter in the entire game. He’s the leader of the Yiga Clan, a group of ninja who can teleport around and unleash powerful attacks. Master Kohga is sub-boss you’ll face during the Divine Beast Vah Naboris questline in The Legend of Zelda: Breath of the Wild. Master Kohga – The Legend of Zelda: Breath of the Wild