สมรภูมิคัลธ์: การปะทะใต้ดิน

Grimdark sci-fi concept art depicting the underground Battle of Calth after the surface was scoured by the Veridian star. [Word Bearers legionnaires in crimson armor] advance relentlessly through ruined subterranean arcologies. Facing them, [Ultramarines in cobalt blue armor] hold defensive choke points inside dark, industrial tunnels. Dramatic cinematic lighting with harsh muzzle flashes, sparks, and distant smoke cutting through deep cavernous shadows, surrounded by shattered plasteel and concrete debris.