User blog comment:Woest/Great Tree Arc and Green Magic/@comment-7418318-20131124184044

Nice theory.

I think that the divine protection that the tree bestows came from the combined efforts of Walrod and Mavis.

Considering how Azuma was able to ursurp the island's magic through the plants, it makes more sense to me that Walrod was somehow involved with the spell, but more involved that just providing the vessel. But at the same time I don't think he (or Mavis too for that matter) could have created such a blessing on his own, so a cooperation seemed like the most likely thing to me.