Adamantine Mace of Smiting

Rare

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 7 bludgeoning damage, or an extra 14 bludgeoning damage if it's a construct. If a construct has 25 hit points or fewer after taking this damage, it is destroyed. Adamantine Weapon. Melee weapons made of or coated with adamantine are unusually effective when used to break objects. Whenever an adamantine weapon hits an object, the hit is a critical hit.