Berserker
WordNet
noun
(1) One of the ancient Norse warriors legendary for working themselves into a frenzy before a battle and fighting with reckless savagery and insane fury
WiktionaryText
Noun
- One of a class of legendary Norse warriors who fought frenzied and shirtless regardless of wounds (possibly due to ingestion of psychotropic and hallucinatory drugs such as Fly Agaric Mushrooms).
- One who fights as if frenzied, like a Berserker.