So whether Frozen: Northern Lights is going to be a short or not (I guess we’ll have to wait and find out. Either way, it’s something new). I have a speculation that the trolls will have a major role.

They reside deep within the mountains where they have the perfect (and closest) view of the Northern Lights.

The Art of Frozen explains that their crystals channel the energy of the aurora borealis, implying that their magic and knowledge of the Earth is connected to this phenomenon. Elsa’s powers could be connected to this phenomenon, especially considering how the aurora borealis was “awake” in the sky the same night of the accident when she was little (whether it’s positively, negatively, or neutrally is up for discussion). Since Kristoff lives with the trolls, we might get more background on him and his troll family as well as the trolls’ magic of the Earth.