Yuzo Koshiro pushing DS FM synthesis until it screams. Etrian Odyssey II from 2008 takes everything the first game established and cranks the intensity. "Primitive Jungle" has these layered FM arpeggios that create this thick canopy of sound on hardware that really shouldn't be able to pull that off.
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The FOE battle theme "Gust of Death" is pure panic, fast tempo with that distinctive crunchy DS distortion that makes every encounter feel desperate. Then the night version of the city theme just... breathes. Completely different energy.
"Blood and Darkness" drops into genuine dread territory with minimal notes. If you played EO2 and grinded floors for hours, these tracks are already burned into your brain.