Fiery Mane and Shadowy Scales

After first HTTYD and after Brave movie. When Merida meets a strange young boy in the forest, she thinks nothing of it. She soon discovers that he has a bigger role in her fate then she could have ever imagined. Both stuck on opposite sides of an old blood feud, can they unite the two worlds? Or will their worlds collide in an epic explosion and fall to pieces? Hiccstrid.