Mace of Smiting

You gain a +1 bonus to attack and damage rolls made with this magic weapon, which increases to +3 when used to attack a construct. When you use this weapon to make an attack and roll a natural 20, it

Damage types
Bludgeoning
Item type
Weapon
Rarity
Rare
Damage
1d6

You gain a +1 bonus to attack and damage rolls made with this magic weapon, which increases to +3 when used to attack a construct.

When you use this weapon to make an attack and roll a natural 20, it deals an extra 2d6 bludgeoning damage, which increases to 4d6 against construct. When this weapon reduces a construct to 25 or fewer hit points, the creature is destroyed

Source and licence

From Level Up: Advanced 5e (A5E SRD).

Licence: SRD (CC BY 4.0).

Every licence notice Tavern Bag relies on.