In the Dark - A Rise of the Guardians FanFic

Pitch Black has returned due to the aid of Darkness.

There's one thing on his mind and it's revenge, and he's got a new plan to do it, one that's better, bigger and much more dramatic. With the aid of a teenage girl, murderer and a blood thirsty unicorn, the Guardians better watch out. Because the Darkness is coming.

AN/ Okay, this is a cross between the movie and the Guardians of Childhood series. I have (unfortunately) not been able to catch any of the other books, so I'm wildly snatching at sub plots here, so please correct me if I'm wrong about anything bookwise.