How could a class with poor int cast various spells?
They wouldn't. They would use limited spells due to their limited intelligence. Limited and none are very VERY different things, and going from one to the other is gamechanging.
Also, you have 5 base intelligence.
Basic intelligence for basic spells. Want to make a character with no spells? Add a talent that lowers intelligence completely to zero in exchange for something else as a tradeoff for not being able to use any form of magic on that character.
