This subject contains information from the Expanded Cthulhu Mythos, and not based on H.P. Lovecraft's works directly. Rhogog was said to be created when Cthulhu and Hastur fought above Britain and Cthulhu shed blood which several Star-Spawn put an 'entity' into for unknown purposes. This 'entity' lay dormant, growing in power until it became Rhogog. Rhogog is a great, black oak tree, hot to the touch, and a being of darkness, and unimaginable power.

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