Volley of Arrows
From Wildermyth Wiki
Volley of Arrows is a temporary ability gained during a Defense battle, if the Train Archers job was completed ahead of time.
In-Game Description
Local archers are supporting you for this fight, tell them where to focus their fire. Archers can fire once every other turn.
Specifics
The 
swift action can be used once every other turn by any of your heroes. As soon as one uses it, it becomes unavailable for all until the cooldown is up.
The ability deals damage to all enemies in a 5x5 grid and pierces 1 armor. Each tile of a large enemy can be hit separately, adding damage. It counts as an attack from the hero who uses the ability, for flanking purposes.
