Expert Ground Fighter

You are adept at fighting while caught on the ground, you gain the following benefits:

• While prone you can use your bonus action to roll out of the way of danger, allowing you to take the disengage action.
• You are proficient with improvised weapons, and you can treat them as simple weapons.
• You no longer have disadvantage on your melee attack rolls due to being prone and being prone does not give advantage to attack rolls against you.
• When you hit a creature with an unarmed strike or an improvised weapon on your turn while you are prone, if the target is Large or smaller, you can use a bonus action to have the target make a Dexterity saving throw (DC 8 + your proficiency bonus + your Dexterity modifier). On a failed save, the target becomes prone.
• Weapon attacks score a critical on a roll of 18 or above.