Hmm...well, off the top of my confuzzled head right now, the only things I can think of is that Vampire dragons have the ability to bite eggs once per month (though it was only released on Halloween, so I'm not sure if they can bite eggs during other months), and turn an egg into a Vampire egg. It's the only way they can 'reproduce'. The egg's parents remain their original parents though, so an Orange and a White might have a Vampire 'descendant'. Also, there's a chance that biting the egg will kill the egg, or that your other dragons will throw the egg out because they are 'repulsed' by it. (poor vampires...so shunned) I managed to keep one of my Vampire eggs that I turned...killed two, and one got chucked out. The only vampire egg that survived promptly got killed when I used Earthquake. Bleagh. -_-

And Zombie dragons are also available again, though I think they can only be successfully made during Halloween, so it's a once-a-year-thing. I have a zombie hatchling right now, though I'm not sure if it'll ever change into an adult. Zombie dragons can only be seen during night, during the day they show up as a gravestone as though it has died. Funny thing is that they show up as zombies during Dragon Cave's night, and tombstones during Dragon Cave's daytime, so most of the time for me it's tombstone during the night, and dragon during the day. -_-;