Photorealistic Lich in a Sunken Underwater Cave

Photorealistic depiction of a lich in a sunken underwater cave. A tall undead sorcerer with a skull-like face and hollow eye sockets that glow faint blue. He wears ornate, tattered ceremonial robes soaked by seawater, bones visible through the fabric. In his grasp is an ancient rune-inscribed staff, and a glowing phylactery pendant hovers near his chest. The cave is lined with stalactites and stalagmites, encrusted with barnacles and coral. Bioluminescent algae and small fish cast eerie blue-green light, while shafts of sunlight filter through the water, creating caustics on rock and bone. Bubbles rise, silt swirls, and the lich exudes a silent, haunting aura. Cinematic, high-detail photorealism with volumetric lighting and realistic water distortion.