Create a 3D model of a powerful "Lava Golem" — a massive humanoid creature made of cracked black volcanic rock with glowing red lava flowing through its body. Its limbs are thick and jagged, with molten veins pulsing beneath the surface. Lava drips from its joints, and its eyes glow with fiery intensity. Include sharp rocky spikes on its shoulders and arms, and a glowing lava core in its chest. The surface texture should appear molten and rugged. All body parts—head, limbs, torso, and core—must be separate objects. The overall look is fierce, ancient, and elemental.