Geas

Mythological taboo or vow

A geis or geas is an idiosyncratic taboo, whether of obligation or prohibition, similar to being under a vow or curse, yet the observance of which can also bring power and blessings. It is also used to mean specifically a spell prohibiting some action. Geasa are common in Irish and Scottish folklore and mythology, as well as in modern English-language fantasy fiction.

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