I'm a little worried about how powerful Dream is, that Balm of the Summer Court ability is crazy good. Maxes out as a bonus action 10d6 healing, with 10 temp hp, and 50ft of increased speed. In smaller chunks it is cool, but that is a lot of healing potential. Plus teleporting ability, and the ability for free dispel magics 3 times a day.
I love it, but is it too good?
Shepherd reminds me of the 4e Shaman, I'd like to see someway to get more auras or get them more often as the Druid levels, because otherwise... it isn't terribly impressive. Though the last three abilities seem rather powerful and cool. 2 of them require you to fall in battle first, but it definetly gives this druid staying power, with a free Death Ward once per day and a summoning of some respectfully powerful beasts to protect you when you fall.
I want to like Twilight more than I do, it has some big damage potential, but I'm with most people in the confusion of why the person killing undead is using necrotic damage. Too many of the undead are resistant or immune to that type. I get the flavor that they are calling upon the realm of death, but it makes them worse at killing undead, not better.
Speech beyond the Grave needs to be a little more clear, I think it uses a spell slot to cast it, but I'm not certain, It is useful in that you can talk to someone whose body you don't have. So, if you have the name of an ancient king you could ask him questions about where the macguffin is. Very cool, but needs to be clearer in the intent.
Over all they look pretty good, but Twilight needs force or radiant damage instead of necrotic and Shepherd needs more auras in the late game.