Ars Magica Wiki
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Spontaneous Magic is the use of magic "on the fly" without a formulaic set of gestures and words. The results are variable and the magus basically makes up the spell as he goes. Casting spells spontaneously is more difficult than using Formulaic Magic and it can be more taxing on the spellcaster. If a magus does not know a spell, he can still cast spontaneously.

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