Unquiet Dagger 2014
Weapon, very rare, (requires attunement)
Forged by creatures with firsthand knowledge of what lies between the stars, this dark gray blade sometimes appears to twitch or ripple like water when not directly observed. You gain a +1 bonus to attack and damage rolls with this magic weapon. In addition, when you hit with an attack using this dagger, the target takes an extra 2d6 psychic damage. You can use an action to cause the blade to ripple for 1 minute. While the blade is rippling, each creature that takes psychic damage from the dagger must succeed on a DC 15 Charisma saving throw or become frightened of you for 1 minute. A frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. The dagger can't be used this way again until the next dawn.
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