Chaos Ball

Chaos Balls are found deep in the crevasses at Corruption. You need to mine or use TNT to get to them and you can only get there by mining with a demonite pickaxe or higher. These Chaos Balls contain items up on smashing it with a hammer, these items are: Ball 'O Hurt, Musket, Orb of Light, Vilethorn and Band of Starpower. (This list might be incomplete but this definately comes out of it.)