Magically-Superior Body (3.5e Trait)
From D&D Wiki
With the belief that you need no magic to enhance your body or mind, you've worked much harder than most to improve it.
Benefit: You now gain ability increases at every even level, instead of at every fourth.
Drawback: You no longer may gain any benefit from any items or spells that grant you a bonus on an ability score.
Special: You may not use this feat in conjunction with the Vow of Poverty feat BoED or similar effects.
Roleplaying Ideas: You are likely to frown on those in your party who rely on magic items to improve themselves, to the extent that you might even try to destroy those items in an attempt to break their dependence.