The serial killer in Werewolf has 5 mafia members. But this serial killer is unusual; if we don't figure him out, he'll kill everyone. The house spirit gets either the 1st or 2nd status during the target check, and he must try to deduce the player's role based on it.
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I've formatted the text; hopefully, it's clearer now.
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And the serial killer leaves clues. One clue per group of killed players, so to speak.
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