"In the Nordic countries, there’s a longstanding mythology of trolls living in the forests.
In ancient times, people truly believed that trolls inhabited the woods and had a kind of control over nature.
And in Nightborn, the forest reflects Saga's emotions and the animalistic, primitive physical side of humankind," said Bergholm.
The director also shared her creative approach to the creatures: "But I also wanted to create my own interpretation of this mythology.
In this film’s logic some humans and trolls have interacted for generations, so perhaps all of us carry a bit of troll's blood.
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That troll's blood might make some of us feel different, awkward in social situations, or out of step with social norms."