A grotesque eldritch horror (monstrous entity:1.3) centered in a dark, cavernous environment, pale gelatinous skin texture with subtle iridescent sheen, multiple vertically stacked mouths with sharp serrated teeth (teeth:1.2), long spindly clawed appendages extending outwards, central towering neck-like appendage, secondary tentacles swirling in the dark foreground, deep shadows, atmospheric volumetric lighting, eerie mystical fog, cold color palette with icy blues and desaturated grays, Lovecraftian aesthetic, dark fantasy digital painting, high contrast, sharp focus on the central beast, intricate organic details, nightmare-inducing creature, cinematic composition, thick oil brushwork style, eerie glowing highlights, haunting and surreal atmosphere, cosmic horror