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• Upon use, kills all enemies in a random unexplored room of the current floor. Where the effect took place, a note can be found lying in a pool of blood on the ground.
• While held: Grants a 20% discount at shops . This discount stacks with other discounts, such as [Disarming Personality] .
• Doesn't lower the price of the [Prime Primer] or the Gnawed Key .
• Increases coolness by 2.

• The player can get money from enemies killed in this way, but pickup drops will likely be stolen by the Rat before the player reaches the room. Chests will spawn normally after clearing rooms with this item.
• This item cannot clear boss rooms.
• [Dog] can dig up pickups after clearing rooms with this item.
• [Master of Unlocking] can grant keys after clearing rooms with this item.
• Prior to the [Supply Drop] Update , Iron Coin did not grant a discount or coolness and was a item.
• The Iron Coin can be picked up multiple times in the same run. Each Iron Coin obtained gives an additional 3 charges.
• The Iron Coin can be used to clear rooms that the Gunsling King chose for a challenge, effectively instantly clearing the room and completing the challenge without the need to enter it, although the player will not receive completion notification on their HUD.
• The Iron Coin discount at shops does stack with [Disarming Personality] for a 32% discount.
• The Iron Coin discount and coolness does not stack with multiple Iron Coins.
• The coin will kill the rats scurrying around outside the entrance to the Resourceful Rat's Lair , potentially making it difficult to find.

Defeat the boss of the Gungeon Proper without getting hit.