There are no distinctive dark essences. The Evil itself feels it is powerful enough to handle everything on it's own. It doesn't need to split up into multiple personalities to get what it wants. As for all the good essences being taken up... most people have left. You can fill in one of their spots, or create your own new one! Healing was taken awhile ago, but it's not anymore. And if you can come up with a new one that sounds reasonable, I'm all up for it.