Reduce Damage [D&D 3.5, Feat]

[Ziegander]

Reduce Damage
Prerequisites: Con 13, Heavy Armor Proficiency
Benefit: As a free action, when you are attacked for the first time in a round, you may subtract a number from your AC to gain an equal amount of Damage Reduction. This penalty cannot exceed your base attack bonus or your AC minus 10. You may use this feat even when it isn't your turn, but not if you are flat-footed. The penalty to AC and gained DR apply until the start of your next turn. DR gained by this feat isn't overcome by any sort of physical attack and does not stack with other sources of DR.
Special: If you wear Heavy Armor, you instead gain twice the number subtracted from your AC as DR. A fighter may select Reduce Damage as one of his fighter bonus feats.