no, but hitting with spell require the guiding stat, and the same stat make them harder to resist... the stat also affects number of spells you can keep in your mind, in certain cases... though it doesnt affect spell slots... so a level 1 wizard with 16 int (+3), can memorice 4 spells... then they have a fixed number of spells slots to cast those memoriced spells, that is soley govenered by levels and in certin cases items...
