Warhammer 40k, Regicide, chess-like battle, Space Marines, Blood Angels, Ultramarines, Orks, tactical positioning, power armor, bolter rifles, chainswords, grimdark atmosphere, futuristic battlefield, war-torn landscape, scattered debris, strategic moves, close combat, ranged warfare, psychic powers, Emperor's will, checkmate, high-detailed armor, dynamic poses, aggressive stances, dramatic lighting, fire and smoke effects, intense facial expressions, 3/4 view, action-packed scene, metallic textures, energy shields, war banners, skulls and iconography, dystopian sci-fi.