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.you can increase the spawn rate of the mobs by placing a Water candle in the spot your patrolling (if you hold one it will further increase the spawn rate).