Berserker Weapons are weapons used by the Berserker Tribe during the series.
List of Weapons
The crossbows are the main weapon the Berserkers use, mostly due to the fact that it is the weapon of choice of Dagur the Deranged, the chief of the Berserkers.
The Berserkers also use a type of spear. it appears to have a blade split into 2 parts at the end. Hiccup is also seen using it to attract lightning in the episode, When Lightning Strikes.