Massive subterranean brass and stone-heavy percussion that actually sounds like being underground. Chance Thomas scored the Mines of Moria expansion for LOTRO and absolutely understood the assignment. Drums in the Deep layers these ritualistic war drums with low choir that makes your skin crawl before any combat even starts.
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Khazad-dûm opens up into something grand and dwarven, all pride and ancient craftsmanship in the brass writing. Then The Golden Wood shifts completely into Lothlórien territory with ethereal strings and woodwinds that feel like stepping into sunlight after hours in the dark.
Flame of Udûn though. Pure terror in orchestral form. If you've been sleeping on MMO soundtracks, this one punches well above what you'd expect from an expansion pack.