Chainbreaker Greatsword 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
Two-Handed
This weapon requires two hands when you attack with it.
Source: Vault of Magic (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details