Chainbreaker Rapier 2014
Weapon, rare
You gain a +1 bonus to attack and damage rolls made with this magic weapon. When you use this weapon to attack or break chains, manacles, or similar metal objects restraining creatures, you have advantage on the attack roll or ability check. In addition, such items have vulnerability to this sword's weapon 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.
Source: Vault of Magic (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details