Penetrating AmmunitionConsumable 12
Source Pathfinder Core Rulebook
Price 400 gp
Weight negligible
Activate 
Interact
This ammunition has a slender shape and a viciously pointed tip. When you activate and shoot penetrating ammunition, the Strike takes the shape of a 60-foot line originating from you.
Roll one attack roll and compare the result to the AC of each target in the line. The ammunition ignores up to 10 of a target's resistance, and it can penetrate walls up to 1 foot thick with Hardness 10 or less. Each target that takes damage from this ammunition also takes 1d6 Persistent Bleed Damage.
If your attack roll result is a natural 20, you improve your degree of success only against the first target in the line, but you can still score a critical hit on other targets if your result exceeds their AC by 10 or more.
If you have access to your bow's critical specialization effect, penetrating ammunition applies that effect only against a target in the last square of the line.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
ConsumableAn item with this trait can be used only once. Unless stated otherwise, it's destroyed after activation. Consumable items include alchemical items and magical consumables such as scrolls and talismans. When a character creates consumable items, they can make them in batches of four.
MagicalSomething with the magical trait is imbued with magical energies not tied to a specific tradition of magic. A magical item radiates a magic aura infused with its dominant school of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.
TransmutationEffects and magic items with this trait are associated with the transmutation school of magic, typically changing something's form.