Evasion

This is a Master Trick — a class feature gained through that class's own talent choices, not a feat you pick through normal feat selection.

A ninja can avoid even magical and unusual attacks with great agility. If she makes a successful Reflex saving throw against an attack that normally deals half damage on a successful save, she instead takes no damage. Evasion can be used only if the ninja is wearing light armor or no armor. A helpless ninja does not gain the benefit of evasion.