Constant Dagger 2014
Weapon, rare
You gain a +1 bonus to attack and damage rolls made with this magic weapon. When you roll a 20 on an attack roll made with this weapon, the target loses its resistance to bludgeoning, piercing, and slashing damage until the start of your next turn. If it has immunity to bludgeoning, piercing, and slashing damage, its immunity instead becomes resistance to such damage until the start of your next turn. If the creature doesn't have resistance or immunity to such damage, you roll your damage dice three times, instead of twice.
Properties
Finesse
When making an attack with a finesse weapon, you use your choice of your Strength or Dexterity modifier for the attack and damage rolls. You must use the same modifier for both rolls.
Light
A light weapon is small and easy to handle, making it ideal for use when fighting with two weapons.
Thrown (range 20/60)
If a weapon has the thrown property, you can throw the weapon to make a ranged attack. If the weapon is a melee weapon, you use the same ability modifier for that attack roll and damage roll that you would use for a melee attack with the weapon. For example, if you throw a handaxe, you use your Strength, but if you throw a dagger, you can use either your Strength or your Dexterity, since the dagger has the finesse property.
Source: Vault of Magic (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details