Primal power flows from the ground to give the weight of stone to your strike and to your skin, shielding you from attack for a moment.

At-Will   ✦     Primal, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. AC

Hit: 1[W] + Strength modifier damage, and you gain a +1 power bonus to AC until the end of your next turn.
Level 21: 2[W] + Strength modifier damage.

Published in Player's Handbook 2, page(s) 154.