Editing Geos:Fate-Fudge Rules:Magic:Imperial Magic (section)

===Modifying the Difficulty: Spell===
	Every aspect the character wishes to add to the spell increases the modified or base difficulty by one.  The modified difficulty is increased if the effect is merely to be enhanced – made bigger, better, longer, more powerful.  (Multiple aspects may be necessary for extreme effects.)  If the spell is to be fundamentally changed, or if is to have secondary effects, add to the base difficulty.  

	Another reason to add to base difficulty would be if the spell does not properly fit into the caster's magical theory, or if the caster should know something she doesn't.  For example, casting a spell to inspire someone to creative genius is normally a Mentem spell – but creativity is an aspect of fire, so the GM may specify that several levels of Ignem would be necessary.  If the caster doesn't have the requisite levels of Ignem, a +1 to the base difficulty (or +1 per missing level of Ignem) would be appropriate.
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