The earth moves in response to your stomping foot or slapping hand, buckling to knock your enemy to its knees.

Encounter  
Minor Action      Close burst 1

Target: Enemies in the burst that are touching the ground

Attack: Strength +2 vs. Fortitude, Constitution +2 vs. Fortitude, or Dexterity +2 vs. Fortitude
Increase to +4 bonus at 11th level, and to +6 bonus at 21st level.

Hit: The target is knocked prone

Special: When you gain this manifestation, choose Strength, Constitution, or Dexterity as the ability score you use when making attack rolls with this power. This choice remains throughout you character's life and does not change the power's other effects.

Published in Forgotten Realms Player's Guide, page(s) 10.