This setup was thrown together quickly after I wanted to create one with a Mason and a Lookout (since I officially named the Lookout). It ended up being similar to Sex and Lies. The Tracker's goal is to find the Lookout, the only mafia he can detect. The Lookout's goal is to find the Mason, as they are a big threat if they successfully spread.
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If it ends up being too townsided, Lookout can be replaced with Scout so as to give the mafia more chances at finding the Masons once they've spread.