17 INt will be plenty, has you play the game you will find tombs that will incress your stats. there is at least on of each but there was 3 wisdom tombs in tails of the sword coast
It takes 20 INT to meerizeevery spell, only Gnomes can do that but Gnomes can only be ilisionists. pluse has a tripple class character you casting level will not reach the level cap, But you can drink a INT potion learn the spell and keep the spell of ther the Potion weres off
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