Inferno

The Dragon Blade, nicknamed Inferno, is the name of Hiccup's new flaming Sword he uses in How to Train Your Dragon 2.

How It Works
This weapon Hiccup designed seems to be powered by the saliva of the Monstrous Nightmare, which keeps the sword alive with fire. Hiccup also carries small pouches that contain the gas of a Hideous Zippleback which spray out of the sword's pommel (which are then sparked by a small flame), thus creating a fire-line that can be used to the wielder's advantage.

How to Train your Dragon 2
Hiccup is seen using the Dragon Blade in order to impress and earn the trust of the dragons in Valka's Ice Cave. Inferno can be used not only for the use of combat, but also to allow him to bond with wild dragons and show them that he is "One of their own."

Appearances

 * How to Train Your Dragon 2

Trivia

 * According to 'The Art of How To Train Your Dragon 2', the Sword is nicknamed Inferno.
 * Inferno is one of three tools used to influence or control dragons with two others: Valka's staff and Drago's bullhook