You raise your fist in the air, calling your allies to form a defensive front at your position.

Daily   ✦     Martial
Standard Action      Close wall 8

Effect: You designate a wall of defensive ground that lasts until the end of your next turn. The wall is 1 square high, and it must include a square you occupy. You and any ally within the wall gain a +1 power bonus to AC, or a +2 power bonus to AC while adjacent to an ally who is also within the wall.

Sustain Minor: The wall persists.

Published in Martial Power 2, page(s) 88.