The Friendship Angel •Hiatus•

Lucy goes on a mission that's only for celestial wizards.
One week passed and she still hadn't returned, so Team Natsu goes to the place where she went for the mission. When they got there it was a meadow.
The weird thing was that Lucy wasn't there, but her keys were and there's a key there that no one's seen before.
Where is Lucy? Why were only her keys there? What is this new key?