Berserkr shifting refers to the ancient Norse warriors that were used to fighting naked with fury and inspiration from the bear or wolf spirit. People who shift berserk are those who run into altered states of consciousness or trances for the purpose of fighting and killing, mainly warriors and assassins.

 A popular myth states that some drugs can help achieve the berserk state, removing pain and fear. They would be used by soldiers (mainly from US and Israel armies) to reach the “condition orange” state.

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