Hiccup gave Toothless the freedom to spend time with the Light Fury in the Hidden World. Eager to find him, Stormfly takes Elsa and Hiccup to the Hidden World. When the Night Fury was found, Hiccup and Elsa learnt that Toothless belongs to the Hidden World. Elsa feels happy for Hiccup’s dragon, but Hiccup, on the other hand, feels depressed to leave his dragon here. Enjoy my edit !