Also, adding to complicated calculations, if you are multiclassing, the last class you take a first level in determines which Spell Save is used for common spells, scrolls and such. So if your character is a Cleric/Wizard/Sorcerer all scrolls and potions depend on your character's charisma not their wisdom. Wisdom is only relevant for their Cleric spells in this scenario. If you want Wisdom to factor into scrolls &c. you have to take the first cleric level last.
