No one had an experience with a D&D campaign ? I.E Descent into Arvernus is designed for 4 to 6 players. What are the difference when you DM it for 4 or 6 friends ? Is that only a question of one or two more monsters in encounters ? Something else ?
I've played PnP with 4-8 characters 1, 2nd and 3.5 but not 5th ed. But looking through Avernus it strikes me as module that favors 1) negotiating and 2) sneaking. Any party that tried direct assault would die pretty quickly.
The campaigns I ran for 4 people had more puzzles and riddles than anything else. The thief got more "stage time" than anyone else "checking for traps and secret doors . . ."