The Cthoul are horrific creatures that exist as much in higher dimensions of realist as they do the Material Plane. Though their forms can shift and morph depending on the circumstance, their true nature being too foreign to mortal comprehension to ever be entirely perceived or grasped, they are most often encountered as think humanoid creatures, with bulbous heads, long tentacles emerging from their lower face, and spindly, clawed fingers.
The Cthoul are not native to our reality, and much of their power comes from their power to draw rules of operation from their twisted, alternate dimensional extensions to wrap and pervert the natural environment. Their home dimension–a palce so wrong by any reasoned thought it is known only as the Inversity–is not well understood, though it is known it has easier access to the lands of Leng and the FiendWebs than normal space. It is believed to be a reality that was entirely formed from the unconscious dreams of the Great Old One, Cthulhu, and that the Cthouls appearance is a trifle of the cosmic demands that reality made on life which evolved from it’s befouled origins. The Cthoul themselves do not speak of this theory, and while they alternatingly venerate and enslave horrific elder beings, they have no special affinity for, or understanding of, Cthulhu.
Ancient, often mind-shattering histories of long-lost alien civilizations claim that once the Cthoul ruled a vast Empire that spanned all of known existence. But that ur-reality was split, with different gods and other cosmic powers scrambling to carve out alterverses over which they would hold sway, and the Cthoul were cut off from much of the mortal mortal existence. Now they can reach realms conceivable by humanoid minds only rarely, though their banishment was neither complete nor absolute. Their twisted star vessels of indescribable color seem able to invade our reality only when those who crave their secrets summon them, or the conjunctions of planar energies form weaknesses in the weft of spacetime they can violate.
Cthoul’s very presence places pressure on the sanity of those who perceive or approach them and they seem sustained (or at least entertained) by this effect, causing them to also be known as lucidivores or “mind eaters.” They are physcially extremely strong and resilient, though each Cthoul appears to be harms by some substance or energy, but there is no commonality to what that is. They also have powerful psionic powers, and know fell magics that can pervert, twist, corrupt, and blast everything from common matter to the very souls of those who oppose them.
Cthoul plans always follow some horrific, aberrant logic, and often involve steps that occur on alternate planes of reality, making their purpose or goal literally incomprehensible to mortal minds. That said, their schemes and efforts always seem bent on creating horror, fear, pain, and despair, and some appear to take particular pleasure in torture specific species, personality types, or even accursed individuals. to be the object of a Cthouls attention for years, or even generations, in particularly dreadful, for they cannot be bargained with or trusted, and their minds can conceive of ordeals no sane being would contemplate, much less inflict on living beings. And even if driven off, slain, or utterly destroyed in normal space, most of a Cthoul exists in reality beyond the reach of even the most powerful outsiders, and once their multidimensional selves heal, they can return to execute more foul events.
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