Improved Uncanny Dodge

This class feature is gained by Barbarians at 5th level and by Rogues at 8th level. This feat provides two benefits to the character:


 * The first is that the feat prevents monsters from receiving the flanking bonus when the character is attacked from behind. This portion of the feat is actually passive.
 * The second is that it can be activated by the character to receive a bonus to their AC and their reflex saving throw for a short time.