https://www.wired.com/story/how-vikings-went-into-trancelike-rage-before-battle/

The legendary Viking warriors known as berserkers were renowned for their ferocity in battle, purportedly fighting in a trancelike state of blind rage (berserkergang), howling like wild animals, biting their shields, and often unable to distinguish between friend and foe in the heat of battle. But historians know very little about the berserkers apart from scattered Old Norse myths and epic sagas. One intriguing hypothesis as to the source of their behavior is that the berserkers ingested a specific kind of mushroom with psychoactive properties. Now an ethnobotanist is challenging that hypothesis, suggesting in a recent paper in The Journal of Ethnopharmacology that henbane is a more likely candidate.

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