Story Idea - The Source Tree

This is another idea which came to me from a random drawing in the margins of some of my notes for school.  In this case, I drew what appears to be a dead tree growing out of a pile of stones.  Perhaps due to my reading of Tolkien's Return of the King, I felt that the tree was still alive despite its appearances.  

A story came to mind of the tree being the source of magic in the world.  Due the drilling of oil and the depletion of natural resources, the energy that flowed into the tree has cut off.  A group of adventurous teenagers (this was an idea from high school) come across a cave that holds the tree.  Somehow they realize that they need to nourish the tree to bring magic back into the world.

As these teens are the first to nourish the tree, they are also the first to gain the benefits from the tree's healing.  They become masters of magic in a world where magic, true magic, has largely been forgotten.  This brings the attention of powerful people from around the world, many of whom with the worst of intentions.

The teens find themselves fighting for their lives and to protect the secret of the source itself.  As with many of my ideas, this one never got much further than this most preliminary stage.