Axe of Doom

The Axe of Doom was the primary weapon of Norbert the Nutjob along with Norberts gigantic sword, the two blades are made of two complete diffrent metals, a blackened evil looking blade and a gold blade, the Axe was lost during How to Ride a Dragons Storm along with the body of Norbert

Use in the Books
The Axe's first appearence was in How to Cheat a Dragons Curse and last appearence How to Ride a Dragon's Storm, it was used both times to kill Norberts arch enemy Hiccup Horrendous Haddock III but failed both times and in the last time it was possibly lost at the bottom of the sea with the liveless body of Norbert. It may return and Norbert along with it but it may not only time will tell.