"Life, I accept your offer. I will become the God of the elves."
After Allen had decided that he would become the God of the elves, the Tree of Life prepared for the transition of faith.
In truth, the Tree of Life did not need faith to get strong, that is one of the reasons why could ask Allen to become the elven God.
One more reason is he knew that he cannot protect the elves on his own. And, at the same time, he also wants his old acquaintance of him to get strong fast by relying upon the elves.
Meanwhile, the tree of life's relation to the elves is like mother and son/daughter. A long time ago, it is said the elves are the children of the Tree of Life. Thus, they were naturally close with the Tree of Life.
On one of the gloomy nights of the Asgardian realm, the queen of the elves is rummaging the library. She was on the section that was only open for her and the Elven King.