- "To North there lay the Land of Dread
whence only evil pathways led
o’er hills of shadow bleak and cold
or Taur-na-Fuin’s haunted hold
where Deadly Nightshade lurked and lay
and never came or moon or day."
- ― Lay of Leithian, Canto I
After the Dagor Bragollach ("Battle of Sudden Flame"), the darkness of Morgoth began to corrupt the northern forests of Dorthonion, and they came to be called Taur-nu-Fuin, the Forest under Nightshade. This name is sometimes also used for the land of Dorthonion itself, after its capture by Morgoth.
In early texts it was spelled Taur-na-Fuin, as seen in the excerpt from the Lay above.