You slam your sword into the ground and send a sonorous boom outward.

Encounter   ✦     Arcane, Thunder, Weapon
Standard Action      Close burst 1

Target: Each creature in the burst

Attack: Intelligence vs. Fortitude

Hit: 2[W] + Intelligence modifier thunder damage. If the target moves before the end of your next turn, it takes 2d8 + your Constitution modifier thunder damage.

  Aegis of Ensnarement: The target is also slowed until the end of your next turn.

Published in Arcane Power, page(s) 63.