Mace of Smiting

You gain a +1 bonus to Attack and Damage Rolls made with this Magic Weapon. The bonus increases to +3 when you use the mace to Attack a Construct. When you roll a 20 on an Attack roll made with this weapon, the target takes an extra 2d6 bludgeoning damage, or an extra 4d6 bludgeoning damage if it's a Construct. If a Construct has 25 Hit Points or fewer after taking this damage, it is destroyed.