Information that would have been filtered by the ley lines entered the world tree as it becomes incredibly familiar with everything in Alfheim. Adrian would not have enabled this if the world tree simply asked him to create a protective barrier. What the world tree wanted is that it could see everything clearly inside of the barrier.
The world tree could already see a lot of things but it wanted to see everything. This meant that every change per second happening in the territory will flood the world tree. Such a burden would have been easy to the world tree but it is also receiving information from all around the world. If one were to compare it to size then the data in Alfheim is in megabits per second while the data from around the world is only in the kilobits per second.
