the NPC will be the Nature Mage Trainer, just called Nature Mage at the moment. First what will happen is there will be a cinematic where the group encounters the Mage and hes mourning over the hundreds of trees that were cut down, and then he turns around and thinks the group are with the people cutting down the trees. He spawns 3 Treants that are quite strong, use your discretion it will take testing to figure out the correct balance, Then he will walk away while the you kill the treants, you talk to him again and hes baffled, he says "No one who destroys nature can kill natures spawn." and he apologizes for the confusion and asks you to do a task for him, kill the sawmill workers and destroy the saw mills