Dramatic Creature Concept of Deep Sea Leviathan

A terrifying yet breathtaking 3D creature concept design render of an ancient deep-sea leviathan monster, featuring translucent bioluminescent skin revealing dark inner organ structures, massive armor-plated scales along its dorsal ridge covered in barnacles and glowing deep-sea photophores, a monstrous jaw lined with rows of needle-sharp glowing teeth, and serpentine tentacles trailing behind it into the black abyssal ocean depths, illuminated by a cold dramatic rim light from underwater volcanic vents below and blue bioluminescent organ glow from within the creature itself, creating intense contrast against the pitch-black water, framed in a dynamic diagonal composition as the leviathan turns toward the camera, captured with a wide-angle virtual underwater lens, 3D Octane Render quality with volumetric silt particles, realistic water displacement, ray-traced subsurface scattering on translucent skin layers, dark epic fantasy mood.