Ancient eldritch sea god inspired by Cthulhu. Tall towering humanoid horror with drowned, decayed anatomy. Skin is mottled abyss-black, rotten kelp green and dead navy blue with faint toxic violet veins that glow dimly beneath translucent patches of skin like trapped bioluminescence. Head is a writhing nest of long slimy tentacles dripping black seawater. Multiple sunken eyes emit a cold ghostly cyan glow. Coral-horn crown fused to skull, covered in barnacles and scars. Ribcage partially exposed, glowing runes carved into flesh. Back tentacles move like sentient limbs. Long claws like jagged volcanic glass. Body leaks dark ink mist that distorts reality. Aura: ominous, ancient, unstoppable cosmic dread.

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