First time GM, and I guess first time poster as well!
I had a question about how to balance the swarm vs my PCs since our group consistently has 4-6 players. Is there any good advice on how to up the challenge in case there's more players since the book states it's designed for 4? I had thought about custom creating some smaller swarm monsters to throw in or scaling the number of mobs based on how many people show up that week.
Guess I should also add that I'm not new to table top games, just specifically new to being the GM.