Improved Uncanny Dodge-Barbarian

At 5th level and higher, a barbarian can no longer be flanked. This defense denies a rogue the ability to sneak attack the barbarian by flanking her, unless the attacker has at least four more rogue levels than the target has barbarian levels.

If a character already has uncanny dodge from another class, the levels from the classes that grant uncanny dodge stack to determine the minimum rogue level required to flank the character.

Improved Uncanny Dodge-Barbarian

Eberron inferno813