Warhammer 40k themed Rimworld colony, space marine, power armor, bolter rifle, Adeptus Mechanicus, servo-skull, imperial guard, ork raider, tyranid infestation, desert wasteland, red sands, mechanicus shrine, imperial bunker, sandstorm, harsh sunlight, top-down perspective, detailed texture, gritty atmosphere, survival struggle, strategic base layout, resource management, futuristic structures, grimdark aesthetic, dystopian environment, advanced technology, 3/4 composition, dynamic shadows, ominous mood.