The one true god of everything is upset with the world, and in particular neckbeards. Thus he will curse the world in a fate we will all regret, and lay down the burden of that fate to you.

He declares he will rewrite the laws of the universe to be irrevocably changed to a set of principles and laws that imitate any single one tabletop game- with all the horrible exploits and abusable mechanics in them.

And he leaves the choice of which TTRPG to pick, to you.

Which one do you pick, and what would you do the first day of this change- while the rest of the world is in a confused panic?