Really cool and love the theme! I like how they are tending to the trees as they grow. I was quite confused by the Outsiders ability but the Law you included did help me understand. I like the image of them running between the trees to help out with different battles. 8 warriors seems like such a little force but I think it's cool that it makes it more of a puzzle to defend the growing trees until they turn into Mature trees.
Very cool faction! What type of animal are they? I'm picturing squirrels but I don't think it was mentioned.