This is the bleakest concept album I've yet encountered, telling the tale of a nameless knight cursed with immortality due to a divine sword he acquired, eventually roaming a dead, sunless world with stars dying out overhead. No release for this knight. The music provides the soundtrack: cold atmospherics and dense funeral doom. If you can't buy a physical copy, at least look up scans of the album art, as the story contained in it adds so much to this desolate tale.
Favorite track: Stygian I: From Tumultuous Heavens… (Descended Forth The Ceaseless Darkness).