You create a small cloud of whirling daggers of force that relentlessly attack creatures in the area.

At-Will   ✦     Arcane, Evocation, Force, Implement, Zone
Standard Action      Area 1 square within 10 squares

Target: Each creature in square

Attack: Intelligence vs. Reflex

Hit: 1d6 + Intelligence modifier force damage.
    Level 21: 2d6 + Intelligence modifier force damage.

Effect: The power's area becomes a zone that lasts until the end of your next turn or until you end it as a minor action. Any creature that enters the zone or starts its turn there takes force damage equal to your Wisdom modifier (minimum 1). A creature can take this damage only once per turn.

Update (2/17/2012)
Changed in December 2011 updates.

Published in Player's Handbook, page(s) 159, Class Compendium.