The Neverwinter Wood (NWN)

This hefty tome attempts a complete history of the Neverwinter Wood, but the crux of what is known is summed up in the following passage:

While many a tale has suggested that there are dark forces that call the wood their home, there is yet no definite answer as to what truly hides within. Many a glade has a guardian force watching over it, but never one so malevolent as is supposedly in residence there. These woods have never been logged by men, for they are feared and shunned by locals, and even orc hordes alter their course around and never through, though usually only after suffering a goodly number of stubborn casualties.