Actually metal-archives labeled them as brutal death metal for a couple of years before i suggested that I'd be changed.
Superion is one of my all time favorite albums. More people should check out Nightbringer.
I'm not sure why people keep on labeling them as "brutal death metal". I find them rather unusual. Metal-Archives suggests "atmospheric DM" which I find more fitting. Their MyFail site actually says "blackened death metal".