Stroke of Genius

You gain a number of Genius Dice, which are d4s, equal to half your proficiency bonus, rounded down. As a bonus action, you can expend one Genius Dice to increase your Intelligence score by one plus the number rolled for thirty seconds. This can raise your Intelligence score above your usual maximum, but it cannot raise your score above 30. You cannot use a Genius Dice while under the effects of another Genius Dice. You regain all expended Genius Dice when you finish a long rest.