Oblivion:Intelligence

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Intelligence is the governing attribute for Conjuration, Mysticism, and Alchemy. It affects:

Base Magicka = Intelligence × 2 + racial and birthsign bonuses

Intelligence does not affect the Magicka cost of spells (see discussion at Magic Overview), however high Intelligence may be necessary to have enough Magicka available to cast the most powerful spells.

[edit] Character Creation

The Races page provides a table summarizing the initial intelligence for each race and gender.

No birthsigns provide intelligence bonuses (although several provide Magicka bonuses).

The following standard classes have intelligence as a class attribute (initial +5 bonus):
- Assassin, Bard, Battlemage, Mage, Sorcerer, Witchhunter

Or any custom class can select Intelligence as one of the custom class' two attributes.

[edit] Notes

When your Intelligence reaches 70 or higher, NPCs will start saying: "You look like a bright one."
Increasing your Intelligence past 100 using Fortify effects will continue to increase your maximum Magicka accordingly (intelligence × 2).