Cthulhu rises from stormy sea as lightning illuminates dark sky.

a fantasy artwork featuring cthulhu, a monstrous deity with bat like wings and an octopus like head, rising from tumultuous ocean waves during a thunderstorm. bright flashes of lightning crisscross the dark, heavy clouds. a small sailing ship is battling the giant waves in the lower left, dwarfed by the immense creature and the storm. the water is a deep greenish blue, with foamy white caps and mist rising from the surface.