You can miss this secret bull armour in Black Myth Wukong that has the best defensive stats in the game. So to get it you need to be in Chapter 5. At the start you find a boss called a Bill X stalwart, defeat him and then talk to him. To start the quest you need to kill four cards for this and you find three on the main path. So just continue Chapter 5 after killing the one that looks like this and go to the Elemental Hall shrine, rest here and then return to the boss arena because now the bull has been transported here, talk to him and then continue with Chapter 5 till the fallen Vernerus Crater shrine. From there simply go like this, follow the path, go left here. When you see the pillar like thing, continue. Continue also go left here near the fallen tower, then near the lava go left again. Many enemies will spawn, hug the wall to the right and then just continue. You will reach the boss arena for the final card. The vid it to enter the secret area, kill the bosses there. At one point you reach this room, look out for a chest here, open it, then kill the final boss and you can craft at least two pieces of this armor set.