The guide still doesn't have anything about barbarian class. You get that by meeting the dwarf girl at the tavern after finishing her quest, listen to her brag and keep up with her drinking. If you accept her offer, you get the barbarian class and a naked wrestling match with her.
Barb dual wields swords or axes and wears light armor, gets +20% evasion +15% crit and -45% HP. It has 2 AoE's with debuffs, a stun attack with 25% chance to kill even bosses, and buffs that increase TP gain, counterattack and crit.
I think it was intended for an all-or-nothing gamble playstyle, but not very viable without a good tank and/or healer.