Usually dark music is minimalistic, but is there a good example of dark maximalism?
This. Maximalism by composition or instrumentation or whut.
A lot of black metal is founded on the premise of romanticism and sounding menacing and Nihilistic, so I don't think it's the darkness OP is going for.
The best description I can give of my favorite version of dark music are the Gone Girl and Silent Hill 2 soundtrack. Some melody distorted with dissonance and odd production choices every now and then. Sinister.
Thoughtful uses of layering, space and bombast. Music that sounds large and dense.
The Damned Things
One Of Us Is The Killer
Alive Or Just Breathing
Flood (Boris isn't really metal, I know)
Some SOAD and Rage Against The Machine records if you even want to count those
I know. Pitiful.
SD Laika is pretty damn maximalist as far as creepy electronic music goes
>Technically speaking, serialism. But serialism sucks
I'm not knowledgeable on the style, but surely there exists some good serialism.
>More practically speaking Death Metal and loads of modern classical (Stravinsky for starters)
This. Perhaps some technical/prog metal (e.g. Cynic, Atheist, Maudlin of the Well etc.)
As far as classical, Bartok can be pretty dark and dissonant. Shostakovich has some twisted melodies. I believe the aggressive rhythms of Stravinsky's Rite of Spring actually caused people to faint and sparked a riot at its premiere.
Say that to my face fucker not online and see what happens
Nine Inch Nails my nigger. The Fragile in particular, or if you're more into instrumentals then check out Still and Ghosts I-IV. Especially since you mentioned Gone Girl, in which Trent Reznor was half of the creative input