Nug and Yeb are sons of Shub-Niggurath. (HPL: "Out of the Eaons") They are twins born from her mating with her husband Yog-Sothoth. (HPL: Selected Letters 5.875) They were "spawned on the Doomed nebula of Zlykarior." (Necro. II, ch.2, par.1)
According to another account by Eibon, the androgynous Cxaxukluth split in two, becoming male Nug and female Yeb. This minority interpretation may just be a textual gloss attempting to harmonize conflicting information. (EXP: "The Second Epistle of Eibon unto his Disciples, or The Apocalypse of Eibon" [Robert M. Price and Laurence J. Cornford)
Nug is the parent of Cthulhu and Yeb is the parent of Tsathoggua (HPL: Selected Letters 4.617) via the influence of Yog-Sothoth. Nug might be known by the name Ptmâk in Hyperborea, as Ptmâk corresponds to the "immediate" parent of Cthulhu. (CIRCLE: letter of Clark Ashton Smith to R.H. Barlow, September 10th, 1935) Dr. Dee calls Nug "Father of Ghouls," a title shared with its spawn Shaurash-Ho. Nug might also be the father of Hastur.
They are 10 feet in diameter in their usual appearance (HPL: Selected Letters 5.875) Both Nug and Yeb closely resemble Shub-Niggurath.
Nug and Yeb are worshipped in K'n-yan (HPL: "The Mound"), Irem (HPL: "The Last Test") and other places and form a kind of yin and yang symbolically. But they have never been resident to Earth. (HPL: Selected Letters 4.617) Although they might have appeared at or near Kadath, and Nug and Yeb are said to be in the Cavern of Prototypes beneath Mount Voormithadreth (which may be extra-dimensional). Nug is a god among ghouls, while Yeb is the leader of Abhoth's Unclean Ones alien cult. (EXP: "The Descent into the Abyss" [Clark Ashton Smith and Lin Carter])
Yes (Yeb of the Whispering Mists) may also have been called Cxaxukluth in Hyperborea since Yeb is the "father" of Tsathoggua. By implication it is male though it may be androgynous. Connected with the "Black Flame," and the instrument of world destruction, "The Furnace of Yeb" in which the flame resides on Earth.
Behind the MythosEdit
There is a Biblical town called Yeb.