Hiccup and the Dragon Riders journey to Glacier Island to find the Snow Wraith, a fearsome dragon that holds the key to the Dragon Eye's mysteries.
Once again in possession of the mysterious cylinder (which Hiccup has christened "Dragon Eye"), the Dragon Riders, along with mute physician Gothi, head to Glacier Island in search of an ice wraith who might hold the key to opening it or unlocking its secrets. Difficulty lies in the lethal, all-white wraith's virtual invisibility, attacking under the camouflage of blizzard whiteouts.—statmanjeff
Hiccup, makes the decision to save his friends, then he goes back for Daguar and takes the Dragon Eye. He knows that there is a missing tooth that is needed to unlock the Dragon Eye. They fly out of the archipelago to find it. They go to Glacier Island to encounter a Snow Wrath.