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Dancing Dodge (3.5e Feat)
From D&D Wiki
Dancing Dodge [Skill, Fighter]
Prerequisite: 15 Dex or Cha
Benefit: Once per round when you get hit in combat, you may attempt a Perform (Dance) check (as a reaction) to negate the hit. The hit is negated if your Dance check result is greater than the opponent’s attack roll. (Essentially, the Dance check result becomes your Armor Class if it’s higher than your regular AC.) Or, you can make a Dance check as a full round action and that check replaces your AC for the round.
Normal: You use your normal AC.
Special: You can only use this feat when you are not flat-footed, you are wearing nothing heaver then light armor, and are only carrying a light load.