Demon Forest Song

A language spoken only by the Demon Forest.
It cannot be spoken, for nobody knows how to speak it.
It cannot be heard, for the Forest has no mouth or mind.
It cannot be written, for no symbols exist for it.
But anyone who comes under the protection of the Forest or asks for its blessing, the Forest may choose to allow conversation between them. It is impossible to describe, but those who have spoken to the Forest know it exists.