From the depths of the drowned city of Carcosa, the Leviathan rises. Its silky smooth skin shimmers with an unnatural psychic glow, a beacon in the gritty, realistic cityscape. It swims with a gluttonous grace, its massive form dwarfed only by the impending meteor shower. This androgynous guardian, a creature of dieselpunk nightmares, wields the very essence of the ocean, capable of unleashing a devastating Tidal Wave spell to seal away the encroaching evils that plague the city. Magical sparkles dance around it, illuminated by the volumetric lighting and the warm, 3000K glow, creating a visually noisy yet captivating spectacle. The fish-eye lens effect distorts the perspective, emphasizing its immense scale as it prepares to unleash its watery wrath.