To get this weapon you have to kill monsters in the Corruption biome during Hardmode and hope for the key to drop. The chests themselves are located within the dungeon. The Scourge of the Corruptor is a very amazing melee weapon and bundled with some good armor will give you solid damage output.
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The Scourge of the Corruptor is a powerful javelin that, upon impact of an enemy or solid block...