The Dragonfang are powerful swords, that were only carried by the Valkyries in battle.
Dragonfangs were the traditional weapon of the Asgardian elite corps known as the Valkyries. As such, the Valkyries wielded their Dragonfangs when they stopped the Goddess of Death Hela from escaping from Hel, although most of them were slaughtered in the process.
The only surviving Valkyrie, Brunnhilde, fled to Sakaar, taking her own Dragonfang with her and keeping it in her apartments on Sakaar. When she agreed to join Thor in the newly founded Revengers, Brunnhilde reclaimed her Dragonfang. Upon gazing it, Thor expressed amazement at the blade. Brunnhilde later used her Dragonfang during the Escape from Sakaar, cutting through the hull of the Sakaaran spaceships chasing the Revengers.
Brunnhilde wielded her Dragonfang during the Battle of the Rainbow Bridge. Thanks to its incredible cutting properties, Brunnhilde easily slayed several Berserkers. Later, as she and Thor fought against Hela, Valkyrie used her sword to pin down the Goddess of Death on the Rainbow Bridge so Thor could collapse it and make Hela fall into the water. As a result, Brunnhilde lost her Dragonfang and was forced to leave Asgard in the Statesman without it.
The Dragonfang are very powerful swords, capable of cutting multiple materials. As such, Valkyrie was able to pierce the hull of a Sakaaran Guards spaceship, quickly destroying it. During the Battle of the Rainbow Bridge, the Dragonfang proved again its efficiency, enabling Valkyrie to stab, cut, and even behead several Berserkers in single blows.
- In the comics, the Dragonfang is a unique sword carved from the bones of an extra-dimensional dragon. It was given to Doctor Strange by the Ancient One, who in turn gave it to Valkyrie after she returned the Ebony Blade to Dane Whitman.