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An evolution of an evening whereby events spiral to a level where good people do bad things, usually regretted the next day, and generally inspired by one person being the group devil who likes to reak havoc. There is a random probability that an evening ends this way, 50/50 usually determined on a toss of a coin or which way the wind blows. Therefore Devilution is the random probability of good being evil and evil being good. Usually determined by a toss of a coin or which way the wind blows.
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