Massive orchestral dread pouring out of every faction like the grimdark itself has a soundtrack budget. Warhammer 40,000: Gladius is a 4X strategy game set on a single hostile planet, and the music gives every race its own sonic identity across 27 tracks.
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"Necrons Theme" is cold, mechanical, almost alien in how empty it feels. The Orks tracks go full tribal percussion and guttural energy, completely different planet from the Aeldari's ethereal strings. "Chaos Theme" does exactly what you'd expect, dissonance and menace layered thick.
Every faction gets a theme and a BGM variant, so you're basically hearing each army's personality twice from different angles. The Tyranid tracks are particularly unsettling. If you've ever stared at a hex grid for six hours straight, this is the soundtrack that was enabling that.