H. P. Lovecraft's essay "Supernatural Horror in Literature"

describes the novel as "one of the most potent pieces of macabre imagination ever written".

Clark Ashton Smith's remarks

wrote of it that "In all literature, there are few works so sheerly remarkable, so purely creative, as The Night Land. Whatever faults this book may possess, however inordinate its length may seem, it impresses the reader as being the ultimate saga of a perishing cosmos, the last epic of a world beleaguered by eternal night and by the unvisageable spawn of darkness. Only a great poet could have conceived and written this story; and it is perhaps not illegitimate to wonder how much of actual prophecy may have been mingled with the poesy.".