Epic Boon
When you score a critical hit with an attack roll, you can roll an additional d20. If the result is within your critical hit range or 1 below that range, the critical hit cascades, and you add one additional set of the attack’s damage dice.
Each time you succeed on a cascade roll, you can expand the range required for the next cascade by 1 and roll another d20.
The cascade ends when you fail a cascade roll or when the cascade range would expand to 1-20.
For example, a creature that normally scores a critical hit on a 20 would need to roll a 20 or 19 on the second d20 to begin the cascade. If successful, it would then need a 20, 19, or 18 on the next roll, and so on.
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