It's all very well having a low (15) intelligence mage and using potions of genius to memorize more spels but you can still only cast spells up to level 7.
Unless you want to spend your whole roleplaying experience quaffing potions before you cast high level spells-can't see the point myself. You're better off just sticking to 18 intelligence when you create your character at the expense of some of the other stats. (or using shadowkeeper if you want the best of all worlds.)
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