Vaati's Wrath is the final of three final bosses in The Minish Cap. It takes on two forms with the first being his main body with two long arms to its sides. Once those are defeated Vaati will turn to using its eyes to shoot electric orbs out at Link.
The battle will begin with Vaati chasing after and possibly shooting you with balls of electricity. He will then force one of his arms into the ground. His arm will pop out where you are standing, and unless you move quick enough, you'll get hurt pretty bad. Once his arm is above ground, it may swing around a few times or shoot small orbs at you. You can shoot the arm with the Cane of Pacci and it will reveal a small opening. Use the size converter behind Vaati to shrink down to Minish size and enter the small hole. Inside, you'll see ten small bladed objects with eyes. All of them are invincible except for one. The one that is not invincible has a brighter eye than the others. Once you have destroyed the correct object, the room will begin to shake. Exit the room and the arm will blow up in four sections. Return to the size converter and return to normal size.
The second arm is taken out in much the same way. Lure Vaati to force the arm underground and dodge the arm when it comes up from the ground. Be careful to avoid any attacks by the arm and hit it with the Cane of Pacci. Shrink down and enter the hole in the arm. Once inside, you will find ten more bladed objects. This time, however, you'll need the Flame Lantern to find the correct bladed object. Once you've destroyed the correct object, exit the room and the arm will explode. Vaati will then grow four tiny wings and the small eyes in front of him will spread out a little bit.
The next part of the battle involves the Four Sword and Vaati pummeling you with tons of electric balls. You must clone yourself and hit the beams Vaati shoots from his four eyes back at him. These beams must hit the eyes they came from. However, there is no set pattern for how many times he will shoot electricity before shooting the eye beams, so watch out. The electric balls will travel in a wave every time, but if an electric ball hits you or any of your clones, you'll get shocked and lose all of your clones. The best strategy to deflect the electric balls is not to spam the button, but instead time your slash carefully to ensure you return all four balls. If all four balls aren't returned, he won't be stunned. Once you've deflected all the beams correctly, the eyes will disappear and Vaati will lose his wings and fall down. Once he has fallen down, he is vulnerable. Swing your sword like crazy until he regrows his wings and eyes.
The same process must be repeated a couple more times for Vaati to be defeated. Clone, dodge, deflect, swing. After Vaati has taken enough he will begin to explode, starting with his eye.
Vaati will call Link a fool and remark of his once great power. He will then start bursting in five places and start blowing up everywhere. The screen will turn white.