Uumuu

Attacks
Creating lightning in random locations, and creating lightning in a trail that follows the player.

Tactics
Although Uumuu may only have two attacks, they're both quite hard to dodge, and their pattern leaves few opportunities for healing. Uumuu cannot be harmed at first, protected by the bubble-like transparent shield that surrounds it. However, Quirrel will appear to help the player, leaping around the battlefield and popping Uumuu's shield. Get in as many hits as you can when Uumuu's shield is popped, and be prepared to dodge an attack right after. In desperate times, this can be an opportunity to heal. Avoid jumping in the water below a platform in the arena, as this greatly slows your movement. As is the case with most boss fights, Quick Focus is highly recommended.