The Great Cataclysm was an event that involved the destruction of the Dark Tower and a lot of the surrounding land. Relatively early in Overlord II while exploring the wasteland that was the Dark Tower, Gnarl Comes to the Realization that the Great Cataclysm was the Result of the Tower Heart Violently Exploding. Near the ending of the game it is reaveled that Florian Greenheart tried to steal the Tower Heart's magic, but caused it to explode causing the Great Cataclysm and the magical plaque.
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