The shadow could be PITCH BLACK 😀
Pitch Black was essentially the Boogeyman from Rise Of The Guardians. He stole the Sandmans’ magic dust (or he learned how to make it, I think) and instead of giving children pleasant dreams, he turned them into nightmares, so that they could BELIEVE in him because in order to have power (or something) kids needed to believe in guardians. Its a dreamworks movie, so IDK if they can do it, but it works.
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"I could have the giant duck as my steed!" --Daniel Radcliffe
Keeper Of Tamara's Taser , Jafar's Staff, Kitsis’s Glasses , Ariel’s Tail, Dopey's Hat , Peter Pan’s Shadow, Outfit, & Pied Cloak,Red Queen's Castle, White Rabbit's Power To World Hop, Zelena's BroomStick, & ALL MAGIC