modified Oathbow) is a feat of gunsmithing and craftsmanship; they are typical firearms for the Knights of the Firelance, some have other properties depending on the properties of the weapon melted down to make the Oath Pistol.
Once per day, if the gunslinger swears his lesson aloud (a free action to gunslingers, a full attack action for everyone else) to an opponent. Against such a sworn enemy, the firearm has a +5 enhancement bonus, and ammunition fired from it deal an additional 2d6 points of damage (Gunslingers enjoy ×3 on a critical hit instead of the normal ×2). After an enemy has been sworn, the firearm is treated as only a masterwork weapon against all foes other than the sworn enemy, and the gunslinger takes a –1 penalty on attack rolls with any weapon other than the oath pistol.
These bonuses and penalties last for 7 days or until the sworn enemy is slain or destroyed by the wielder of the oath pistol, whichever comes first. The oath pistol may only have one sworn enemy at a time. Once the wielder swears to slay a target, he cannot make a new oath until he has slain that target or 7 days have passed. Even if the wielder slays the sworn enemy on the same day that he makes the oath, he cannot activate the oath pistol’s special power again until 24 hours have passed from the time he made the oath.