The Dragon Den is a beautiful place full of green rock pillars and light blue water. It has plants growing everywhere, and has cliffs and many waterfalls in it. There are also mountain areas in the Dragon Den, and lots of rivers and deltas. There is also clear white-ish mist all around the den. There are many caverns and holes in the rock pillars and cliffs and other places. The entire lair is hidden by spires of greenish ice produced by the King.
The Dragon Den's climate is unknown, but it seems humid. Note that there are many places in the caverns that have ice in them; it may be cold at the outside but warm at the inside.
Twenty years later, Hiccup and Toothless are found by Valka and her swarm of dragons and taken to the den where he learns of the Bewilderbeast and Valka's history with them. Stoick, Gobber and their dragons follow the scent of Hiccup's helmet to the den where they find both Hiccup and Valka hiding away.
Drago locates the nest and deploys his army, only for Valka and her army of dragons to fight back. Her bewilderbeast emerges from the mountain, only to be countered by Drago's. His bewilderbeast kills the Alpha, takes control of the other dragons and flies off, leaving the nest barren.
It is assumed that some of the dragons returned after Toothless' victory though it is unlikely.
Role in the CrossoverEdit
While the dragon fortress was abandoned by Valka and her dragons since the death of the Alpha that dwells there, the unique "architecture" of the area and historical signifigance to the citizens of Berk allow the Dragon's Hide as a hide-out for dragons, the Big Four or possibly spirits who have taken a liking to it.