The Verse (Episode 3, Season 3) - Boreal and John Grey

Cross the Gate with Finn and Ella into Aelfheim, the mythical world of the elves. Deep in Aelfheim country, Ella, Finn and Elsen are making their escape from the underground military base, with the aid of the dragon Snowstorm. Their first destination is a Boreal supply station, and their immediate goal is survival. Both their escape and survival might prove tricky, though, given that Queen Adramar has set all her forces in pursuit - the Boreal dragon rider unit, all her spies as well as the machines under her control.
But even if Ella and the two elves managed to shake off their pursuers, Aelfheim isn't a world to be taken lightly. As she soon discovers, Finn's tales didn't quite do justice to the savage animals, crazy rogue machines, or the treacherous climate conditions of this frozen world. If the snowstorms and deadly winds don't get them, if the sleeping towers don't rise from the snow and shoot them down, if the rock wolves and ice cats don't have them for dinner.
then there's hope for another day.