Intelligence determines how well your character learns and reasons. This ability is important for wizards because it affects how many spells they can cast, how hard their spells are to resist, and how powerful their spells can be. It's also important for any character who wants to have a wide assortment of skills.
You apply your character's Intelligence modifier to:
• The number of languages your character knows at the start of the game.
• The number of skill points gained each level. (But your character always gets at least 1 skill point per level.)
gains bonus spells based on her Intelligence score. The minimum Intelligence score needed to cast a wizard
spell is 10 + the spell's level.
An animal has an Intelligence score of 1 or 2. A creature of humanlike intelligence has a score of at least 3.