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Was thinking of Town of Salem 2 would make a good champygame. It's a social deduction game that's free on steam, up to 15 players. 15 seems like a pretty big ask though and I don't know how functional it'd be with smaller numbers.
I'm nod familiar with Town of Salem itself but I've played many games similar to it and there moight be a bit of learning curve to figure out what each roles do to start making any real sense of the social deduction element but after learning the ropes, the mafia/werewolf-like games are a hoot.