Much like weapons, armors can be made from special materials. Each one affects its performance differently from making armors that are too bulky yet offer tons of defense and offering very fast armor made from special materials such as Mithral. Most armor uses iron except for any designated as “Leather” and “Hide”. Because of this, they don’t benefit from the iron material being applied to them.
Reduction of Armor Penalty can only bring an armor piece to a minimum of 0 AP, meaning it doesn’t apply or remove any. Deflection can be reduced to a minimum of 0 (meaning it grants no protection), and weight to 0 making it effectively weightless.
Unlike weapons, special materials don’t have greater bonuses beyond their listed effects.