As part of this action, make a Strength check. As you slam your fists into the ground, you send out a shockwave in a 15 foot cone in front of you. Creatures must make a Dexterity saving throw or take damage based your results:

• 9 and below = 1d4 bludgeoning
• 10 to 14 = 1d6 force damage
• 15 to 19 = 1d8 force damage
• 20 and above = 1d8 + 1d4 force damage
  This spell's damage increases by 1d8 when you reach when you reach 5th level (2d8 + 1d4), 11th level (3d8 + 1d4), and 17th level (4d8 + 1d4).