I had to look it up. So, Larian homebrew strikes again.
Tavern Brawler
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.
Who the hell thinks changing this into giving +4 att / dmg, or better, is a sane idea? In a system where a feat is something that gives you +1 / +1. How out of touch can they be?
What Larian are doing by allowing very unbalanced builds to exist is creating unnecessary tension between players. Who wants to play multiplayer when there's always going to be that one person who wants to play the S tier build that can one hit bosses? And doesn't care if they ruin it for the others. Irresponsible of devs to leave their mess for players to sort out.