You erect an impenetrable wall of shimmering force, capable of turning aside a charging giant or a storm of ballistae.

Daily   ✦     Arcane, Conjuration, Force
Standard Action      Area wall 4 within 10

Effect: You conjure an invisible wall of contiguous squares that is permeable to your arcane abilities. The wall can be 4 squares long and 4 squares high. The barrier does not prevent movement, but instead blocks line of effect for ranged and area attacks. However, your ranged and area attack powers ignore this barrier.

Sustain Minor: The wall persists.

Published in Forgotten Realms Player's Guide, page(s) 69.