Combat Antimagic (3.5e Feat)
From D&D Wiki
Combat Antimagic [Combat Form]
Your intense concentration on the battle allows you to shake off magic.
Benefit: While your Combat Focus is active you gain spell resistance equal to 5 + character level. You gain a +1 bonus to that SR for every Combat Form feat that you possess.
Special: A fighter may select Combat Antimagic as one of his fighter bonus feats.