When you reach 13th level, you can quickly cobble together a strong plan of action, even in the heat of the moment. As an action on your turn, or whenever you roll initiative, you may expend a Perfect Plan dice and call out an impromptu plan to a number of creatures that can hear you, up to 1 + your Intelligence modifier (minimum of 2). Each of those creatures gains an Improvisation die, which is a d4.

Once within the next minute, the creature can roll the die and add the number rolled to one ability check, attack roll, or saving throw it makes. The creature can wait until after it rolls the d20 before deciding to use the Improvisation die, but must decide before the DM says whether the roll succeeds or fails. Once the Improvisation die is rolled, it is lost. A creature can have only one Improvisation die at a time.

You may use this feature a number of times equal to your proficiency bonus, regaining all expended uses whenever you complete a long rest.