Geas

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

A geis or geas (pl. geasa) 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. The word "geas" is also used to mean specifically a spell prohibiting some action.

Excerpt from the Wikipedia article “Geas”, under the CC BY-SA 4.0 license. Read the article on Wikipedia