You gain a +1 bonus to attack rolls and damage rolls made with this magic weapon. The bonus increases to +3 when you use the weapon 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 14 Bludgeoning damage if it’s a Construct. If a Construct has 25 Hit Points or fewer after taking this damage, it is destroyed.
RollQuest summary +1 mace (+3 vs Constructs). When you roll a 20 on an attack roll with it: extra 7 Bludgeoning (14 vs a Construct); a Construct at 25 HP or fewer after this damage is destroyed.
RollQuest ships the D&D 2024 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.