Hair’s Breadth (Ex)
Source: Adventurer's Guide, p. 144
Once per day when subject to a critical hit, the lore warden can attempt an Acrobatics check to reduce the damage as an immediate action. If the result of this Acrobatics check is greater than the opponent’s confirmation roll, she negates the critical hit; the attack still hits and deals normal damage. The lore warden must be at least 11th level to select this swords secret. At 15th level she can use this secret one additional time per day.