Forsaken Forest, Forsaken Cave

http://reneaigner.deviantart.com/art/Places-Forgotten-375508720

Drak's Cave only appeared on moon-lit nights; full moons who spread their pale blankets of moonlight across the vast Forsaken Forest. None entered this cavern of nightmares, for here was the domain of insanity, and evil.
Many a mercenary had tried and failed to probe the depths of Drak's Cave. Entire parties of adventurer's had waited impatiently on the threshold of that pale green madness, only to step inside and never return.
No one ever returned from Drak's Cave, until a quiet, unassuming child found her way into the deep, dark forest one night, becoming hopelessly lost from her friends. Unable to feel the dark energy emanating from the glowing cavern, she entered to await the dawn.
The girl emerged on the same day she entered, some nine years later. The world had moved on, her friends had moved on; her family had lost all hope.
She was the same, yet very different. A ill quiet followed her, and the young girl's eyes glowed the same pale green as the phosphorescence of the cave.
Though her lips never moved, she communicated quite clearly, holding anyone near her enthralled. Everyone listened, everyone obeyed.
And soon everyone was brave enough to enter Drak's Cave