I doubt that hallucinogenic mushrooms were used as a catalyst for berserker rage, but evidence of A. muscaria use among older populations in Siberia and perhaps

I doubt that hallucinogenic mushrooms were used as a catalyst for berserker rage, but evidence of A. muscaria use among older populations in Siberia and perhaps Lapland exists. I think it is possible that A. muscaria use happened among the Viking population for religious/ritual use.