The Dark mage's origin?

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Jenka and Ballos were brother and sister, Ballos goes mad with power and destroys a city, Jenka seals her brother, and later a hero comes along and defeats him for good.

I think you meant. "How on earth isn't this Cave Story?"

Yeah, I know that, but that doesn't relate at all to

was an ancient city that was part of the temple of time, but it was destroyed by the dark mage

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