In Final Fantasy IV, what do you think is the end result of remaining a Dark Knight for too long?
You lose all "goodness" and become a stereotypical mustache-twirling bad guy
You are possessed by Zemus
You are eaten/possessed by other dark spirits or the armor or sword itself
It does eventually kill you, but like a disease, and you do keep your "self"
You "wither" away to nothing, speechless like the reflection Cecil fought
It's metaphorical, most Dark Knights just get depressed or tired and give up
It's superstition, Fusoya says some darkness is natural. Just be careful
It's like an addiction somehow, and you eventually sacrifice too much health
You will think only fighting solves your problems, until you get killed or die
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