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 4d6 bludgeoning damage if it’s a construct. If a construct has 25 hit points or fewer after taking this damage, it is destroyed.
RollQuest ships the D&D 2014 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.