Photorealistic cinematic portrait of Santa Claus as a Space Marine Terminator Psyker, depicted as a real human encased in immense, ancient power armour. The armour is cathedral-scale, brutal and functional, with layered ceramite plates, exposed cabling, sacred seals, burn scars and devotional etchings. No toy proportions, no stylisation. This is a living man inside a war machine. Santa is older, broad-shouldered, bearded, weathered, stern. White beard braided with purity seals and faint frost forming along the tips. Eyes glow faintly with psychic light, subtle and controlled. Red elements are woven into the armour as faded heraldry and cloth tabards, not festive decoration. The colour palette is dark crimson, bone, gunmetal, soot-black and candle-gold. He carries a grim psyker’s staff instead of a weapon: massive, relic-like, topped with a cracked halo and suspended psychic crystal, emitting cold blue-white warp energy. Psychic frost curls through the air around him, implying impossible speed and omnipresence. Helmet optional but present nearby or retracted; facial expression calm, absolute, judgmental. This Santa is ancient, relentless, inevitable. Environment: vast gothic interior or snow-choked battlefield ruin, towering arches, burning candles, drifting ash and snow. Cinematic low-angle shot, 85mm lens feel, shallow depth of field, volumetric lighting, dramatic rim light. Hyper-detailed textures, skin pores, fabric weave, metal wear.