I personally love the Darkfallen Druid. I wish they could select the Kul Tiran druid forms though, to really complete the aesthetic. I just use the artifact forms that are less animal and more plant, or the nightmare ones that look passably undead. It also does make sense since we've already been told with Kul Tiran druid lore and Ardenweald that the cycle of life and death are all natural aspects.