Way back in July, I played in a oneshot at our nearby game store.
It was kind of a disaster.
It was the first time the DM had DMed in public and for more than his three at-home players … and we had seven. The adventure was for 4th level characters.
One guy … that guy … had a 12th level multiclassed mess.
The DM didn’t have the courage to say “no” and “that guy” kind of ruined the game for the rest of us.
Fast forward to a couple weeks ago, and “that guy” was sitting at our Tomb of Annihilation table. He’d brought a yeti homebrew he found somewhere online, a character with 125 feet of movement speed and an AoE fear roar that he could do as an at-will action.
And fortunately, our DM this time laughed and said, “Yeah … no.”
The guy proceeded to be “that guy” for a good portion of the night, but having a DM that was willing to shut him down was frankly amazing for the rest of us.
Personally, I don’t mind confronting a player like that. But that’s something that’s the DM’s job.
Whether you realize it or not, your players look to you to be the arbiter of everything at your table, even things not mechanics-related that they might otherwise take care of themselves. Whether your players have fun or not largely rests on your shoulders.
It’s a big responsibility. Don’t let them down.
Now get out there and tell a story!