C'kud'thulhu, otherwise known as C'thulhu or Cathulhu, is a major antagonist in the Kingdom Hearts Unlimited Saga, only appearing in "The Keyblade Wars" as the ruler of the Old Ones' fortress of R'lyeh. It is he who leads the Deep Ones in the worship of their eldritch masters and galvanizes them into an effective fighting force against Atlantis to make way for the coming of the true King of Darkness, Chernabog.
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