You can use a bonus action to roll a d6. On your next attack, you score a critical hit on any natural roll that matches or exceeds 20 minus the result of your d6. (For example, if you roll a 4, you will have a critical hit on a natural 16, 17, 18, 19, or 20).
You can use this ability once per short rest (or twice per short rest once reaching level 10).
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