Into the Shadows

Most think after Sauron's defeat, all peace to Middle-Earth has come. But that wasn't the story....In the world of the great Valar, Morgoth seeks revenge on Middle-Earth and is determined to reclaim what his most powerful servant couldn't.
All the realms ruled by men shall be burnt.
All the realms ruled by elves shall be shattered.
All the realms ruled by dwarves shall be destroyed.

And all the ruins of this world shall be restored.

Morgoth, now full of power, along with the giant spider Ungoliant are awaiting the time of destruction.

Then, there's a young elven ranger. She lurks in the shadows, infamous for her disguised face. Traveling the lands, half seen in Bree. But yet no one knows who this elleth is, the only name they've heard of is her Northern Ranger name; Shadow. Mostly called that cause she wonders throughout the Misty Mountains unseen. Her true name, no one knows. So can this elleth be the light in the darkness of battle? Who is she? And why is she so important?