Berserker

The Berserkers was the name of a caste of Wookiee warriors. They typically entered battle wielding two extremely large Ryyk blades, and were equipped with light armor for maximum mobility on the battlefield. The Berserkers were fierce combatants, fast-moving and very quick in their attacks, particularly when they used jetpacks.

Behind the scenes
Berserk is an Old Norse word that means 'bear skin' and refers to a select sect of Viking warriors. Metaphorically (as in the case here) it refers to any warrior who becomes extremely fierce and lethal (i.e., to 'go berserk!') in battle. It was also said that Berserkers were, before battle, drugged and indulged in copious amounts of alcohol that created a state of madness (some of the effects could be irreversible, which connects with another legend: some berserkers were caged before and after battle) in which the berserker couldn't even see the difference between an enemy and an ally.

Aron Peacebringer also compared the Calian Battle madness to "berserker rage"

Appearances

 * Star Wars: Galactic Battlegrounds