Signature Technique

You've developed a powerful technique using your weapon of choice: A unique move that only you know how to pull off.

• Choose the range and shape for your signature technique: A 20-foot cone, a 15-foot square, a 10-foot radius sphere, or a 30 foot long and 5 foot wide line. Regardless of your choice, the technique originates from your position. You cannot change your choice later.
• When you take the Attack action on your turn, you can replace one of your attacks with this your signature technique. Each creature within range must then make a Dexterity saving throw, taking 3d6 + your proficiency bonus damage on a failed save and half as much on a success. The damage type is either bludgeoning, piercing or slashing (You choose which when you gain this feat). The DC for this saving throw is calculated as 8 + your proficiency bonus + your Strength or Dexterity modifier (your choice).
• You can use this signature technique a number of times equal to your proficiency bonus and regain all uses when you finish a long rest.