A bag of blood-stained gold coins carved with the symbol of an unknown patron. When you receive the bag, it contains 30d12 gold pieces stained in blood. Removing the pieces seems transient - at dawn, they reappear in the bag, coated in blood, and merchants are reviled at the mere sight of the coins no matter the amount of cleaning. Despite this, the bag of coins is calming, and makes it holder intimately - safely - aware that the coins are to be spent, and how. Even so, no single holder may "spend" more than three coins throughout his life, death, reincarnation, rebirth or undeath. No excuses...
When a roll you make with disadvantage comes to an unfavourable result, spend a coin* and declare the new result of your choice, as long as it was possible to achieve this result with the type and number of die rolled, after applying relevant modifiers. It was worth it, right?
*There are additional costs invoked the character is unaware of. Ask your DM if you should be privy to this.
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