You spread invisible patches of ice on the battlefield. When your enemies stumble into the traps, a hail of crystals erupts around them.

Encounter   ✦     Arcane, Cold, Conjuration, Implement
Standard Action      Close burst 5

Effect: You conjure two ice shard traps in two different unoccupied squares on the ground within the burst. The traps are invisible to your enemies and last until the end of your next turn. When an enemy enters a trap's square, make the following attack against that enemy as a free action. Then the trap disappears.

  Attack: Intelligence vs. Fortitude

  Hit: 1d8 + Intelligence modifier cold damage, and the target gains vulnerable 5 cold and grants combat advantage until the end of your next turn.

Published in Dragon Magazine 403.