I second Watchman's response. The reality or otherwise of magic is irrelevant. What is relevant is whether there are believers engaged in such rituals, and whether such rituals are seen as threatening. Think Santeria and the suspicion and persecution it endures as well as its potential to countervene animal-cruelty laws and the like.
Non-Scandanavian berserker behavior is not unknown: Celtic gaesatae, Aztec quachicqueh, Malay amoks, Arab ghazzis, arguably kamikazes and modern-day suicide bombers.
On the herbal-enhancement theory, I saw a documentary some years ago about Isandhlwana examining, among other things, the role of Zulu witch-doctors in pre-battle rituals. (It may have been an episode of Battlefield Detectives, but don't quote me on that).
Most, if not all, the Zulus heading in to battle snorted cannabis snuff. The particular strain of cannabis used was found to be extremely high in THC, which is a stimulant, and very low the depressant cannabinoid pychoactive (I forget what it's called). The use of stimulants in modern war is well documented, i.e. the Wehrmact's amphetamine-laced "panzerchocolate" and the USAF's "go pills", and have been implicated in wrecklessness, atrocities, and friendly-fire incidents - classic "berserkergang" behavior.
In addition to "normal stimulants", select volunteers who were sworn to die in battle were given psilocybin mushrooms. Most interestingly, as part of the investigation, two skilled judoka were brought in. While sober, the two were essentially evenly matched. After setting this baseline, one was given psilocybin, the other a placebo. From this point onward, the "dosed" judoka consistently defeated his non-dosed counterpart. On the other hand, the tripping judoka couldn't complete simple square-peg-round-hole cognitive tests.
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