Please pardon anything I'm saying that isn't quite up to date. I'm still playing 0.20 so some of what I bring up might have been fixed. (I have my reasons)
Werewolves have been causing some interesting things to happen. First, after building Blood of the Phoenix, I got a Blooded to promote to a Greater, and then another Blooded spawned in my capital. Then, I was playing as Basium and whenever a werewolf got promoted I got a free angel. Now, I like extra units and all, but is there a smoother way to upgrade werewolves rather than killing them and replacing them with a better one?