A "Berserker" refers to a warrior from Norse mythology who fought with intense fury and strength. These fighters were known for entering a trance-like state during battle, which made them fearless and incredibly powerful. The term is often associated with the Vikings, who believed that consuming certain substances or rituals could invoke this berserk state. Historically, Berserkers were thought to wear bear skins, which contributed to their fierce reputation. They were often depicted as being immune to pain and capable of extraordinary feats in combat. The concept of the Berserker has influenced modern literature and popular culture, appearing in various forms of media.