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I don't know, I'm not the GM. But I have a plan.
Gentlemen, listen to me. It is in everyone's best interest to identify the maniac and prevent him from causing an armageddon. But who among you can say with certainty that Heaven is the maniac? No one can know for sure, which means we need to investigate. I propose that we execute Heaven, and if he uses the "escape execution" ability, then at night, the Mafia sends him to the astral plane before he can use the armageddon ability. If Heaven is executed, then he is not the maniac, and the Mafia will have to choose another target to send to the astral plane and try to prevent the armageddon.
What do you think?