Tavern Slammer

Accustomed to throwing your weight and size around in a scuffle, you have become skilled at using whatever happens to be at hand as a weapon,  you gain the following benefits:

• You ignore the object property of improvised weapons with which you are proficient.
• You can make improvised weapon attacks using creatures grappled by you as improvised weapons. 
• Grappled creatures being used as improvised weapons lack the "thrown" property unless you are considered two sizes or larger.
• You can use the shove attack action to try and slam a creature grappled by you to the ground. To do so make a shove check. If you succeed the target takes 1d4 bludgeoning damage and is knocked prone.
• When you hit a creature with an improvised weapon attack using another grappled creature as your improvised weapon, the grappled creature takes your strength modifier in bludgeoning damage. This damage increases by 1d4 when you are considered one size larger than the grapple creature, 1d6 when you are considered two sizes larger than the grapple creature, 1d8 when you are considered three sizes larger than the grappled creature, 1d10 when you are considered four sizes larger than the grapple creature, 1d12 if you are considered five sizes or larger than the grappled creature.