This is the first I've heard of this band, though I believe they have released a split vinyl with Pest, and possibly other works as well. They're a German band playing a unique style of Black Metal.
"Von Schemen und Trugbildern" is probably one of the most original releases I've heard in a while. It's very avantgarde music. The obvious comparison would be with fellow German art-metallers Bethlehem, but while that band occasionally let the artsy aspects get in the way of the metal, Grabnebelfursten do nothing that detracts from the insane, chaotic atmosphere of this disc.