Overconfident Gambit

With utter certainty, you announce your impending success and the impressive means by which you’ll achieve it. The sheer audacity of the attempt makes it that much more inspiring if you succeed.

When you take the Attack or Tumble actions or use a Basic Maneuver, but before any dice are rolled, you can use your reaction to activate this maneuver. When using this maneuver, you can’t gain the benefits of any expertise die for attack rolls , ability checks , or saving throws made during the triggering action.

If you succeed, all allies (other than you) within 30 feet that were able to see you do so gain advantage on their next attack roll, ability check, or saving throw if it is made within a number of rounds equal to your Charisma modifier. If the roll for the triggering action is a critical success, this duration becomes 1 minute.