SRD5:Mace of Smiting
From Dungeons and Dragons Wiki
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When you roll a 20 on an attack roll made with this weapon, the target takes an extra 2d6 bludgeoning damage, or 4d6 bludgeoning damage if it’s a construct. If a construct has 25 hit points or fewer after taking this damage, it is destroyed.
|Mace of Smiting||+1||1d6 Bludgeoning||4 lbs|
|1Magic bonus is not included in listed damage.|