The Nocturnal Silence is a great album but it doesn't sound anywhere near as clean as Hrimthursum does so I'm not really sure about that one and I don't know how it's more complex. It's a lot duller musically, IMO. Erm...so anyways, blackened death that might do...:
Deviser - Transmission to Chaos/Unspeakable Cults
Both really good albums, I don't like their latest effort though.
Maaaaybe...
In Battle - Kingdom of Fear/Welcome to the Battlefield/Rage of the Northmen
In that order.