|“||There are openings which human beings know nothing of — some of them are in these very Vermont hills — and great worlds of unknown life down there; blue-litten K’n-yan, red-litten Yoth, and black, lightless N'kai.||„|
|~ HPL , The Whisperer in Darkness|
Below the ruins of Yoth in K'n-yan is the black realm N'kai populated with peculiar-sensed beings which had forged great civilisations without any light at all even before the emergence of the people of Yoth. N'kai is the source of the multiple black idols and images of Tsathoggua. The Yothic manuscripts were scoured by archaeologists for references to N’kai, and even singular stone troughs or burrows had excited infinite speculation. Though the manuscript described it as barren the one expedition from Tsath found that it had been repopulated by a collection of formless black blobs that worshipped onyx and basalt images of Tsathoggua. Much later a second attempt to access the depths was made but neither they nor Zamacona y Nuñez were able to find the entrance.
N'kai is known to be the current residence of the Great Old One Tsathoggua and it’s guardians, the Formless Spawn.