Heavy Weapon Duelist

You have learned to use great weapons with one hand. Properly positioning their weight and size in a way that makes it possible to do so without losing their balance.

If you are a medium sized creature or larger, you gain the following list of features. If you are a size of small, you instead are able to use heavy weapons without any disadvantage.

• This feat allows you to carry two-handed, and heavy melee weapons with just one hand. When wielding a weapon of this kind with one hand, you are also considered to be wielding it with two for the purposes of other features.
• When wielding heavy weapons in one hand, the damage dice they were previously is changed to the dice depicted in the following chart.

• When you make an attack that does not already have disadvantage with a weapon that you are wielding in one hand, you can choose to give the attack disadvantage. If you hit with the attack, if the creature is of one size category larger than you or smaller you can choose to as part of that attack attempt to knock the creature back. Make a Strength (Athletics) check contested by a check of the same type by the target. If you win, they are knocked back 5ft, plus an additional 5ft for every size category smaller than you they are. If they win, nothing happens.

This is not my original feat, I just transferred it from the Desmon Arnold HB Players Companion.