Rowan RifleWeapon 16
Source Pathfinder Guns & Gears
Damage 1d8 Fire
Type Advanced
Range 300 feet
Price 14,000 gp
Weight negligible
In a dense forest within Arcadia, djezet fell from the sky millennia ago, even before Earthfall. While this metal was poisonous to most of the plant life growing nearby, one stubborn rowan tree refused to die, its roots slowly absorbing djezet in small particles from the ground until the entire plant was suffused with it. Fey bowyers discovered the remarkable plant and coaxed it into growing into a very particular shape, its branching trunks woven together into a tightly twisted and naturally rifled barrel.
One of the legendary star guns, Arcadia's greatest treasures, the Rowan Rifle is a +2 greater fearsome speed greater striking advanced firearm with a range of increment of 300 feet. It deals 1d8 fire damage and has the backstabber, concussive, and fatal d12 traits. As a star gun, the Rowan Rifle runs on magic, and doesn't use ammunition or black powder.
As a weapon forged to protect the fey peoples of Arcadia, the Rowan Rifle's enchantments prevent it from ever causing harm to a creature with the fey trait; any attempt to shoot a fey with it results in an automatic misfire. This legendary star gun is as much a badge of office as a weapon, as it denotes dominion over all Briarbough. If the Rowan Rifle's wielder is fey, or if they were specifically given the Rowan Rifle by a fey creature who recognized them as a worthy champion, they can use the following activations.
Activate 
envision
Effect You will the Rowan Rifle to change the energy it fires from the white-hot energy of summer that glows like a star to the shivering chill of winter, the crackling electricity of the storm, or even the sonic vibrations of a roar. The Rowan Rifle's damage type changes from its current damage type to cold, electricity, fire, or sonic. On the next sunrise, the Rowan Rifle returns to dealing fire damage.
Effect: Rowan Rifle (Cold)
Effect: Rowan Rifle (Electricity)
Effect: Rowan Rifle (Sonic)
Activate command, Interact
Effect The Rowan Rifle fires a 60-foot line of liquid djezet that wraps around all creatures in the affected area before hardening, which impedes them with metallic vines unless the affected creature succeeds at a DC 35 reflex save. A creature who fails the save takes a -15-foot circumstance penalty to their Speeds, and a creature who critically fails is Immobilized. A creature who succeeds at a DC 35 Escape check ends this effect. Otherwise, the djezet vines last for 10 minutes before crumbling away.
Activate command, envision, Interact (1 minute)
Frequency once per 10 minutes
Effect You hold aloft the Rowan Rifle and step into a tree in Briarbough, and you tree stride to another tree in Briarbough.
Traits
A rules element with this trait is one-of-a-kind. The DC of Recall Knowledge checks related to creatures with this trait is increased by 10.
BackstabberWhen you hit a flat-footed creature, this weapon deals 1 precision damage in addition to its normal damage. The precision damage increases to 2 if the weapon is a +3 weapon.
ConcussiveThese weapons smash as much as puncture. When determining a creature's resistance or immunity to damage from this weapon, use the weaker of the target's resistance or immunity to piercing or to bludgeoning. For instance, if the creature were immune to piercing and had no resistance or immunity to bludgeoning damage, it would take full damage from a concussive weapon. Resistance or immunity to all physical damage, or all damage, applies as normal.
FatalThe fatal trait includes a die size. On a critical hit, the weapon's damage die increases to that die size instead of the normal die size, and the weapon adds one additional damage die of the listed size.