Heavy orchestral percussion that hits like a raid boss spawning. Fate/Grand Order Original Soundtrack IV covers some of FGO's wildest story chapters on mobile, and the production quality is absurd for a phone game. "The Final Dark God -BATTLE 10-" is the kind of boss theme that makes you put your phone down and just listen.
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"Kyoka Suigetsu" floats in with this eerie calm that contrasts everything around it. "Karma Ataraxia" carries weight. Like the composers understood exactly what that story moment needed and delivered something that sticks with you.
The Ooku and Yugakshetra chapter themes shift between unsettling and grand, sometimes in the same track. If you ground through Lostbelt content without headphones, you missed half the experience.