Godsbreath BowWeapon 15
Source Pathfinder Lost Omens: Monsters of Myth
Damage 1d6 Piercing
Type Martial
Range 60 feet
Price 6,500 gp
Weight 1 bulk
This +2 greater striking composite shortbow is made from wood, horn, and sinew. Once wielded by Ninshaburian heretics, it's carried in a leather case etched with images of Namzaruum in combat with Somnalu. On a successful Strike, it deals an additional 1d6 bludgeoning damage.
Activate 
command
Frequency once per day
Effect You make a ranged Strike. On a hit, a vortex of air trails the arrow as it travels. When the arrow strikes its target, the vortex expands to a 30-foot radius from its point of impact. The arrow deals an additional 1d8 bludgeoning damage against its target. For the next 3 minutes, any physical ranged attacks that would strike a target within the vortex deal an additional 1d8 bludgeoning damage. The vortex is difficult terrain, and creatures attempting to fly through the vortex using a move action must attempt a DC 34 fortitude save, losing its move action on a failed save. Any gases within the vortex are cleared by the winds.
Traits
This rarity indicates that a rules element is very difficult to find in the game world. A rare feat, spell, item or the like is available to players only if the GM decides to include it in the game, typically through discovery during play. Creatures with this trait are rare. They typically can't be summoned. The DC of Recall Knowledge checks related to these creatures is increased by 5.
DeadlyOn a critical hit, the weapon adds a weapon damage die of the listed size. Roll this after doubling the weapon's damage. This increases to two dice if the weapon has a greater striking rune and three dice if the weapon has a major striking rune. For instance, a rapier with a greater striking rune deals 2d8 extra piercing damage on a critical hit. An ability that changes the size of the weapon's normal damage dice doesn't change the size of its deadly die.
PropulsiveYou add half your Strength modifier (if positive) to damage rolls with a propulsive ranged weapon. If you have a negative Strength modifier, you add your full Strength modifier instead.