What Norse warriors fought in trance-like fury?

Berserkers is correct: in Norse lore, these elite warriors fought in a trance-like rage called berserksgangr, seeming immune to pain and fear. The name likely comes from “ber-serkr,” meaning “bear-shirt,” hinting at warriors who wore bearskins and channeled an animalistic fury. Saga accounts describe them biting their shields, howling, and becoming terrifying shock troops. They were linked to Odin, god of frenzy and ecstasy, and related wolf-warriors called úlfhéðnar. To remember: Berserkers “go berserk”—the modern phrase comes from them. Contrast the options: Vikings were seafaring raiders/traders in general, Jotunheimers are giants from Jötunheimr, and Draugrs are undead beings. Berserkers stand out as the human warriors whose battle-madness made them legendary.