Calamity

With a singular point of your finger, you curse the fate of a creature within range to certain disaster. The target must make an Intelligence saving throw. Upon a failed save, the target's next three rolls-- such as Attack rolls, saving throws, ability checks, or any guaranteed dice roll created by a class or racial trait-- are automatically treated as 1's for the duration of this spell. Upon a successful save, the target's next three rolls-- such as Attack rolls, saving throws, ability checks, or any guaranteed dice roll created by a class or racial trait-- are automatically treated as 10's for the duration of this spell.

This spell immediately ends if the creature's hit points are reduced to zero. Once a creature has been under the effects of this spell, they are immune to the spell's effects for the next 24 hours. Finally, there is a 10 percent chance that you are unable to cast Calamity ever again.