Blade of the Dervish 2014
Weapon, rare, (requires attunement)
This magic scimitar is empowered by your movements. For every 10 feet you move before making an attack, you gain a +1 bonus to the attack and damage rolls of that attack, and the scimitar deals an extra 1d6 slashing damage if the attack hits (maximum of +3 and 3d6). In addition, if you use the Dash action and move within 5 feet of a creature, you can attack that creature as a bonus action. On a hit, the target takes an extra 2d6 slashing damage.
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.
Source: Vault of Magic (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details