A majestic dark fantasy illustration of a muscular Santa Claus warrior with luminous white skin glowing under moonlight, prominent black ram's horns curving from his head, wild boar tusks protruding from his mouth, fierce mesmerizing green and gray eyes with intense gaze, short stylish buzz cut jet-black mohawk, full black beard, dressed in sleek black tactical armor with black bear fur trim suggesting barbaric warrior aesthetic, holding an ancient ivory-handled battle axe with intricate engravings, standing beside a ferocious razor-back wild boar companion, set in an ancient medieval street during a frosty Christmas winter night, shimmering snowflakes dancing in the air reflecting the warm glow of aurora borealis illuminating the scene with ethereal green and blue lights, full moon visible in the background, skull decorations and bones scattered around suggesting dark magic, ornate medieval lantern staff providing warm light, magnificent winter bone cave in the shape of a skull visible in the distance on snow-covered mountainside creating ominous backdrop, inspired by the dark fantasy aesthetic of Terry Pratchett's Hogfather and the art of Gerald Brom, painted in epic fantasy illustration style.