05-22-2013, 07:21 PM
In a world where all of civilization exists in the sky, Aerocite crystals are an expensive commodity, as levitation is one of their properties, so they are frequently used to sustain large airships.
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Hot air balloons were thought to have been the first ships that took to the clouds during the Age of Aeronautic Exploration long ago. Those who cannot afford to buy Aerocite use hot air balloon technology. Merchants have switched to using hot air balloons to transport goods because the risk of being attacked by sky pirates seeking the sky crystals was too great.