Corruption Key Mold

The Corruption Key Mold is a rare drop used to craft the Corruption Key. It has a 1/2500 (0.04%) chance to drop from Corruption enemies once a world has entered Hardmode.

Farming

 * A good way to farm for Corruption Key Molds is to farm the Eater of Worlds as each segment counts as a separate mob. Invasions can also be of great help. You could also just wander around the surface of the corruption because of all the enemies that spawn at any time.