|Locations of interest|
|First appearance||Myst: The Book of D'ni|
Terahnee is an age that was rediscovered by Atrus after having been securely sealed in a vault by the D'ni. The age of Tehrahnee is an immensely beautiful age inhabited by people very closely related to the D'ni. It is speculated that they came from a common relative, especially because they both practice The Art.
By some providence to protect Atrus et al., the Terahnee and D'ni languages apparently had sound and grammar shifts parallel enough to remain mutually intelligible, despite the long separation and massive differences in culture and values.
The Terahnee culture is extremely complex. It involves a system of Lords, that rule over individual areas. The entire Age is ruled over by a King. In Myst: The Book of D'ni, the king befriends Atrus and his companions because they are from D'ni. At first Atrus and his friends believe that Terahnee is a culture for them to admire, and consider moving all the D'ni people to it; but later discover that Terahnee is actually built, and operated, by billions of slaves taken from their native ages. Shortly thereafter, the ruling class of Terahnee are exterminated by a pandemic, and the Age itself abandoned.