A highly detailed, visceral confrontation between a Xenomorph and Predator on a nightmarish alien planet. The Xenomorph, with its sleek, biomechanical exoskeleton glistening with acidic saliva, lunges with its inner jaw extended. The Predator, adorned in intricate, high-tech armor with glowing tribal markings, readies its wrist blades and shoulder-mounted plasma caster. The alien landscape features grotesque, fleshy vegetation with pulsating pods and twisted, bone-like structures. Thick, toxic mist swirls around their feet, illuminated by the eerie glow of three moons in various phases. In the background, the ruins of an ancient alien civilization loom, half-buried in the hostile terrain. The scene is bathed in an unsettling, otherworldly light that casts long, menacing shadows. Particle effects of dust and spores float in the air, adding to the foreboding atmosphere. Photorealistic 3D model; high contrast lighting with hints of bioluminescence; ultra-high detail; octane render; volumetric lighting and fog.