Forest of Night
A forest north of Leth Deriel, it is actually a portion of the Endrus Forest that was wickedly twisted by Sithsia to protect Leth Deriel from an advancing army. Formerly the location of Lord Ellington's realm. Now home to creatures like the Blood Nyad, Blood Dryad, and Death Spirit.
Extensively described in The Forest of Night by Asha Viriki.