Inner Storm

You have a hidden wellspring of inner unknown power, through trial and error you've learned to direct it.

• You have 3 storm points. Whenever you make an attack roll, an ability check, or a saving throw, you can spend one storm point to double the value of your role. You can choose to spend one of your storm points after you roll the die, but before the outcome is determined.
• You can also spend one storm point to double your AC until the start of your next turn. You may choose to do so when an attack roll is made against you but not after knowing if the attack will hit or not. 
• You regain your expended storm points when you finish a long rest.