Legendary Dreadnought:
Combat Brute now correctly grants +50% damage against helpless targets while active. The three weapon-type specific * Vorpal Strikes now functions as a toggle as described, and correctly applies its Vorpal effect to unarmed attacks. The slashing damage is now correctly only applied when the toggle is activated.
Is the underlined part in reference to: Volcano's edge, Lightning mace, or Anvil of thunder?
If it does refer to the aforementioned, what one specifically works with unarmed attacks?