Defensive Roll (3.5e Feat)

3e Summary::evade 1 attack per day using Reflex Save

Prerequisite: Dex 17, Dodge, Dodge

Benefit: The user can roll with a potentially lethal blow to take less damage from it than she otherwise would. Once per day, when she would be reduced to 0 or fewer hit points by damage in combat (from a weapon or other blow, not a spell or special ability), the user can attempt to roll with the damage. To use this ability, the user must attempt a Reflex saving throw (DC=damage dealt). If the save succeeds, she takes only half damage from the blow; if it fails, she takes full damage. —if she is denied her Dexterity bonus to AC, she can’t use this ability.

Normal: You would not be able to dodge an attack that would kill.