From publisher blurb:
New ways to rage! With The Escalated Barbarian, your barbaric character gets new talents, backgrounds, uniques, plus variants to bring your barbarian rage to a suitably bloody climax. With magic items to equip your barbarian and new abilities like Tooth and Nail, Release the Beast, and Barbaric Yawp, you’ll be ready for whatever the forbidding wildernesses or teeming city-states throw at you. Civilizations may fall, but your barbarian never will!