Cthulhu (commonly preceeded by "Great" or Old" is a monstrous being belonging to a group of entities known simply as the "Old Ones" which ruled over the Earth and allegedly warred with the Elder Things before the time of man. Great Cthulhu currently remains imprisoned in the great cyclopean, sunken city of R'lyeh (assumed to be near Valparaiso) in a death-like state awaiting the day the stars are right, when he will resume his glorious rule of earth in an orgy of destruction.
While psychicly sensitive humans have been contacted by Cthulhu through telepathy (which is assumed to be the "language" of the Old Ones), the only reported sighting by a human in recorded history occured on March 23, 1925. This was twenty-two days after R'lyeh rose above the water, only to sink once more shortly after when the merciful stars' shifting position caused Cthulhu to resume his death (the conditions required for R'lyeh to rise are also required for the Old Ones to live). This was reported by Gusaf Johansen, the only remaining crew member of the Emma. He later died under mysterious circumstances in his hometown of Oslo.
Cthulhu is described as resembling a green humanoid with draconian wings, and a head resembling an octopus (though it is believed Cthulhu is not composed of matter. While it is a common misconception that Cthulhu is evil, it is worth noting that he/it appears to be amoral, viewing humans as pests (akin to human views and actions with insects).
Ph'nglui mglw'nafh Cthulhu R'lyeh wagn'nagl fhtagn
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