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Tundra wind
druid attack 3

A roaring wind batters your foes, encrusting them with ice and knocking them to the ground.

Target: each creature in the blast

Attack: Wisdom vs. Fortitude

Hit: 2d6 + Wisdom modifier cold damage. The target is knocked prone.
Primal Guardian: The user also pushes the target a number of squares up to his or her Constitution modifier.

Tundra wind is a 3rd-level druid encounter attack power. Creatures within its blast that are hit take cold damage and are knocked prone. If the user has the Primal Guardian aspect, tundra wind also pushes hit creatures.[PH2:87]