Arandor
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On the other hand, if the Mafia wrote a note to help one of their own, then it's obvious that this trick won't work, because a Town member wouldn't write about themselves. But the Mafia could have written it so that we would think they are defending their own, when in reality they aren't. But in any case, Omega doesn't seem like a Town member among the revealed roles. Maybe there's a hidden role without citizenship, or maybe he's a Serial Killer.
Be strong. Believe