Flamewall Strike
Swordmage Attack 7
Wall 3 within 1 square
Effect: "You conjure a wall of contiguous squares filled with leaping flames that lasts until the start of your next turn. The wall can be 3 squares long and no more than 1 square high. Only 1 square of the wall must be within 1 square of you. Any creature that enters the wall’s space or starts its turn there takes 1d8 + Constitution modifier fire damage"[FRPG:30]
Flamewall Strike is an encounter power available to swordmages at 7th level.