Dungeon Mayhem

That's it really. The game is amazing, super quick to learn and play. It also has ton of D&D references, so its great to fill in spots of sessions that didn't come together. I used it at a board game night with seven people and it worked fantastically. 

There is a base game with four characters, an expansion with two more, and finally a second expansion with six more, but storage to put the first six in the same box.

dnd.wizards.com/products/dungeon-mayhem