Obsidian Lock Box

The Obsidian Lock Box is a grab bag-type item which can be obtained from Obsidian or Hellstone Crates with 100% chance. It always contains one rare item normally found in locked Shadow Chests in the Underworld. It requires a Shadow Key to be in your inventory to open the box, which can be found in locked Gold Chests or Golden Lock Boxes in the Dungeon.