The main-thing with intelligence is the maximum of spells you would be able to learn per rank (1-9).
example :
INT 18 = max. 18 spells per rank
INT 17 = max. 14
INT 9 = max. 6
but its no problem to learn any spell per rank, just drink an intelligence potion (just know the german names) and then copy the scrolls. When the effect fades the spells will remain in your book. INT 19 is needed to learn unlimited number of spells.
The potions arenīt rare or expensive (300-600 G), my mage owns about sixteen in capter 2 /level 12
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