eldritch creature, Brain of Cthulhu, summoning item, Suspicious Looking Eye, dark crimson, pulsating, tentacles, organic texture, fleshy, glowing, eerie, Lovecraftian horror, night, full moon, misty, ancient ruins, eldritch altar, sacrificial symbols, ambient occlusion, dynamic shadows, horror atmosphere, 3/4 view, atmospheric lighting, high detail, vivid colors, ominous presence, depth of field, close-up on item.