Blue
Ravenous Bugblatter Beast of Traal
This is the first time I've heard of this. But it just gives rise to the question, Why is the Barbarian its own class and not a subclass of Fighter? Its niche obviously isn't wide enough to support a whole class, as evidenced by the weak subclass offerings (weak from a conceptual, not power perspective).
The total barbarian package is both the base class plus the subclasses. Just because the base class has more of the focus (like it does for many of the other classes) doesn't mean that the whole class should have been reduced to a subclass and have most of it's uniqueness carved down to fit in a few subclass spots at a power level equal to the just some other subclass.