Noun
A Berserker, or Norse warrior who fought without armor, or shirt of mail. Hence, adverbially: Without shirt of mail or armor.
Source: Webster's dictionary...the baresark loses all fear; his method is all-out attack, and invariably he takes his opponent with him even if he falls. David Gemmell
There is only one way to survive in war, and that is by being willing to die. You will find soon that swordsmen can be downed by untutored savages who would slice their fingers if asked to carve meat. And why? because the savage is willing. Worse, he may be a baresark. David Gemmell