Maul Master (5e Feat)

Prerequisites: Proficiency with Mauls
You gain the following benefits:

You gain a +1 bonus to attack rolls you make with mauls.
Whenever you have advantage on a melee attack roll you make a maul and hit, you can choose to knock the target prone if the lower of the two d20 rolls would also hit the target.
Whenever you have disadvantage on a melee attack roll you make a maul, the target takes bludgeoning damage equal to your Strength modifier (minimum of 0) if the attack misses but the higher of the two d20 rolls would have hit.
When you use a maul, you treat a roll of the weapons damage die as a 2 if a 1 is rolled.