The term 'Frenzied Warrior' can be summarized as a Berserker, which is a Norse warrior who fought in a trance-like fury. Berserkers were known for their fearlessness and strength in battle, often disregarding their own safety in order to achieve victory. They were said to be immune to pain and would often go into a trance-like state before battle, allowing them to fight with an almost superhuman strength.