This is an automatically translated description

Dragons are winning the war against the Vikings. Only the emergence of a new King can save people, to whom the Defenders of the forbidden island of Zavetolia will reveal the secret of the Dragon Stone.

However, to do this, they must bring all ten lost royal Treasures and do so no later than the eve of the solar equinox. Hiccup the Terrible Perch the Third and his friends have a few days left to recover the Treasures stolen by Alvin the Traitor, or else the dragons will disappear forever.