The Kingdom Keepers book series by Ridley Pearson is as follows:
Kingdom Keepers I: Disney After Dark
Kingdom Keepers II: Disney at Dawn
Kingdom Keepers III: Disney in Shadow
Kingdom Keepers IV: Power Play
Kingdom Keepers V: Shell Game
Kingdom Keepers VI: Dark Passage
Kingdom Keepers VII: The Insider
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The plot of the video game, the dark age of Camelot, is to use
your forces to try and defeat the medeival forces and dragons that
are trying to take over your kingdom
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you have to suck the essence out of doctor F's lab
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Riku is seen with the Dark Keyblade when Sora talks to him in
Hollow Bastion in the original Kingdom Hearts game. However, Riku
changes it when Sora fights him.