Ægishjálmur (Helm of Awe)modern
Eight-armed protective stave to overcome enemies and cast fear.
Tradition: icelandic, grimoire · Period: Icelandic grimoires, 17th–19th c.
Modern history: The "helm of terror" is named in Eddic poetry, but this sign is early-modern Icelandic grimoire magic, not Viking-age.
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Sources
Image: Public domain · Ch1902 · source. Please keep this credit when you use it.