Potion of Maximum Power

From Kronopolis and the Flat Plane
Potion, Uncommon

This glowing purple liquid smells of sugar and plum, but it has a muddy taste.

The first time you cast a damage-dealing spell of 4th level or lower within 1 minute after drinking the potion, instead of rolling dice to determine the damage dealt, you can instead use the highest number possible for each die.