D20:Intelligence Term

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.)
  

• Appraise, Craft, Decipher Script, Disable Device, Forgery, Knowledge, Search, and Spellcraft checks. These are the skills that have Intelligence as their key ability.
  

A wizards 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.
A character does not retroactively get additional skill points for previous levels if she increases her intelligence.
Any creature that can think, learn, or remember has at least 1 point of Intelligence. A creature with no Intelligence score is mindless, an automaton operating on simple instincts or programmed instructions. It has immunity to mind-affecting effects (charms, compulsions, phantasms, patterns, and morale effects) and automatically fails Intelligence checks.
Mindless creatures do not gain feats or skills, although they may have bonus feats or racial skill bonuses.

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