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Improved Deft Dodger (3.5e Feat)
From D&D Wiki
Improved Deft Dodger [Combat, General]
Through strenuous training you have mastered reacting to your opponents blunders.
Prerequisite: Bab +10, Deft Dodger
Benefit: While on total defense if your opponent rolls a natural 1 on an attack roll you have the option of taking an attack of opportunity, taking this attack places you into fighting defensively until the beginning of your next turn.