Double or Nothing

Subclass featureValdaGunslinger2014Gunslinger

When you score a Critical Hit using a Ranged weapon, you can gamble for a higher result. Roll a d20. If the roll is a 10 or higher, roll all of the attack's damage dice four times and add them together, instead of only two times as normal for a Critical Hit. If you roll a 9 or lower on the d20, the Critical Hit becomes a normal hit.

Raw data
{
  "name": "Double or Nothing",
  "level": 14,
  "__prop": "subclassFeature",
  "header": 2,
  "source": "ValdaGunslinger",
  "entries": [
    "When you score a {@variantrule Critical Hit|XPHB} using a Ranged weapon, you can gamble for a higher result. Roll a {@dice d20}. If the roll is a 10 or higher, roll all of the attack's damage dice four times and add them together, instead of only two times as normal for a {@variantrule Critical Hit|XPHB}. If you roll a 9 or lower on the {@dice d20}, the {@variantrule Critical Hit|XPHB} becomes a normal hit."
  ],
  "className": "Gunslinger",
  "classSource": "ValdaGunslinger",
  "subclassSource": "ValdaGunslinger",
  "subclassShortName": "High Roller"
}