Ultimate World Key

The Ultimate World Key is an Insanemode Pre-Worldhoard Item that can be used to unlock the world, letting you venture past the world's edges in all 4 directions, unveiling the Cloudlands North, the vast oceans and other regions East and West, and the Deep Underworld, and later the Shadowland, South. Once the Key is used, 3 new Corruption/Crimson counterparts will now be an option in new worlds. These are the Grim, the Toxique, and the Hunger. Finally, the World Key allows the spawning of the Crystalline Bosses. The Ultimate World Key has a 100% chance of dropping from the Moon Lord.