The armory is run by a group of animals on Mistmantle. They are part of the circle, and help the captains organize all the weapons for wars. The armory is also in charge of making new swords for the captains.
Husk puts Granite in charge of the Armory. This is because of his knowledge of weapons and since he can help build his secret supply of weapons.
When the ravens attack, all animals go to the armory to get weapons to fight with. Crispin also makes sure that the armory is stocked well with bows and swords. Most of the animals in the fight get their weapons from the armory.
When the Mistmantle animals go to fight on Swan Isle, the armory supplies them with bows, arrows, helmets, and swords.