Chaos (Sonic)

Chaos is the enemy in the game Sonic XD. When Dr. Eggman calls on the water god chaos to help him take over the world it starts as a little water creature. But as it gains chaos emeralds it gains a more powerful stronger limb until it is a 20 story tall monster that can only be hurt by running through its head. While sonic trys to hit him he has the power to make water spouts and little energy balls and a lazer beam to try and keep him away.