space marine, power armor, Horus Heresy, Warhammer 40k, bolter rifle, chainsword, grimdark, battle stance, dynamic pose, legion emblem, ceramite, gothic architecture, war-torn battlefield, smoldering ruins, dystopian future, colossal titan, mechanical dreadnought, ornate detailing, baroque armor, crimson cape, eagle-winged helmet, skull motifs, imperial iconography, chaos corruption, warp energy, psychic lightning, explosive action, fire and smoke effects, dramatic lighting, high contrast, wide-angle shot, devastated cityscape, towering spires, apocalyptic sky, molten lava flows, hulking tanks, artillery barrage, aerial dogfights, drop pods descending, 3/4 composition, detailed texture, metallic sheen, reflective surfaces.