Air Barrier (Su)
Source: Advanced Class Guide, p. 46
The shaman creates an invisible shell of air that grants her a +4 armor bonus to AC. At 7th level and every 4 levels thereafter, this bonus increases by 2. At 13th level, this barrier causes incoming arrows, rays, and other ranged attacks requiring an attack roll against her to suffer a 50% miss chance. The shaman can use this barrier for 1 hour per shaman level. This duration does not need to be consecutive, but it must be spent in 1-hour increments.