The air shield ability gives the unit a percent chance to ignore non-area of effect projectile attacks that would otherwise hit it. As well as bow and crossbow projectiles, this also affects projectiles created by spells such as Blade Wind and Iron Blizzard. Projectile spells with a described area of greater than "one person" are unaffected.

The Air Shield spell applies this effect to the caster, while the Arrow Fend spell grants it to all allied units on the entire battlefield.