Accustomed to the rough-and-tumble fighting using whatever weapons happen to be at hand, you gain the following benefits:
Increase your Strength or Consititution score by 1, to a maximum of 20.
You are proficient with improvised weapons.
Your unarmed strike uses a d4 for damage.
When you hit a creature with an unarmed strike or an improvised weapon on your turn, you can use a bonus action to attempt to grapple the target.