Magehunter Blade

Weapon (any sword), very rare (requires attunement)
  Made of a Weave-intersecting alloy, these armaments were the go-to weapon for the mage-hunting Order of the Spellbreakers. Fanatical elements within the order have recently taken power, bringing with them an abhorrence for all things arcane. Having largely destroyed their magical arsenal, such weapons have become very rare and are only wielded by the few who cling to the old ways.
  You have a +2 bonus to attack and damage rolls made with this magic weapon.
  Dispel Magic. If you hit a target that is under the effect of a spell or magical effect, the effect is dispelled if it is 5th-level or lower, and the target takes an additional 1d8 force damage for each level of the dispelled spell (dispelled cantrips deal no additional damage). Once a spell is dispelled, roll a d6. If the number is equal to or lower than the level of the dispelled spell, the blade loses this property until the following dawn.
  Rare variant: Change the bonus to + 1, the spell level to 3rd-level or lower, and the d6 to a d4.
  Legendary variant: Change the bonus to + 3, the spell level to 7th-level or lower, and the d6 to a d8.