B

 
Battle Maiden - The stuff of wonder and legend, battle maidens are an order of mounted female samurai whose swift, fearless attacks are renowned throughout the world.  Battle maidens maintain a tradition of martial prowess tempered by spiritual purity.  (from Oriental Adventures) Requirements:
Gender:
Female
Alignment: Any lawful
BAB: +7
Handle Animal: 10 ranks
Ride: 10 ranks
Feats: Mounted Combat, Ride-by Attack, Spirited Charge
Special: Battle maidens are not local to the campaign region of Stormkeep and thus not likely to be very available for PC's.
Battlerager - The dwarven battlerager is famous for the fury he unleashes upon his racial foes in battle. Requirements:
Race:
Dwarf
BAB:
+5
Feats:
Weapon Proficiency (in Dwarven Waraxe or other dwarven preferred weapon).
Special:
Must have suffered profound personal loss, due to the depredations of orcs or other goblinoids.
Bear Warrior - By adopting the bear as a totem animal, these warriors hope to tap some of the strength of the bear.  Bear warriors are most often the champions of barbarian villages.  (from Oriental Adventures) Requirements:
BAB:
+7
Feats: Power Attack
Special: Rage, fury or Ki frenzy ability.
Beastmaster - Seemingly as feral as that which they associate with, they tend to shun human cities and towns, preferring to live in the wilds. 
(from the Dungeon Crawl)

Requirements:
Align:
Any neutral
Base Attack:
+3
Ability: Charisma 12+
Skills: Ride 4 ranks, Handle Animal 4 Ranks, Wilderness Lore 4 Ranks
Feats: Track
Special: PC must be dedicated to nature in some way (worship of a nature god or a defender of the wilds, etc.) and cannot reside within a city or town.

Blackguard - The epitome of evil, the blackguard is the quintessential black Knight. Not available to PC's in Stormkeep campaign.
Blade Dancer - To these warriors, the blade is more than a weapon, it is an ally, a friend, a spirit companion.  Viewing combat as an art, a deadly dance, Blade Dancers are prone to singing in battle.  Through a combination of martial prowess and magical study, they gain phenomenal acrobatic ability and the power to enchant their blade in combat.  (from Oriental Adventures) Requirements:
BAB:
+7
Alignment: any lawful
Jump: 12 ranks
Tumble: 12 ranks
Feats: Dodge, Mobility, Spring Attack
Spellcasting: Able to cast arcane or divine spells.
Special: Proficiency with any sword.
Bladesinger - Elves who have blended the art of swordplay and arcane magic into a harmonious whole, Bladesingers are a marvel to observe in battle. From Tome and Blood Requirements:
Racial:
Elf or half-elf
BAB: +5
Concentration: 4 ranks
Perform (Dance): 3 ranks
Perform (Sing): 3 ranks
Tumble: 3 ranks
Feats: Combat Casting, Dodge, Expertise, Still Spell, Weapon Focus (longsword or elven thinblade)
Spellcasting:  Ability to cast arcane spells of 1st level or higher
Special: Proficiency with longsword or elven thinblade.
Blessed of Gruumsh - an orc or half-orc that is favored by his dark-tempered god, the Blessed of Gruumsh exemplify all that is orc.  They are masters of combat and intimidation, and are feared by many. (from Dragon #282) Requirements:
Alignment:
Non-good
Racial: Must have orc-blood
BAB: +6
Knowledge (religion): 3 ranks
Weapon Proficiency: Orc Double Axe
Feats: Power Attack, Cleave
Special: Must remove one eye in a ritual dedicated to Gruumsh.
Blood Adept - Spellcasters who have learned the dark secret of drawing on life force, through blood,  to enhance their spells. (From Blood Witch in Relics & Rituals) Blood Adepts follow the a path condoned only by the dark gods, and thus are not available to PC's in the Stormkeep campaign.
Blood Magus - Blood magi are formerly deceased spellcasters who, when returned to life, gain an understanding of their blood's importance.  They learn to evoke magic from this vital fluid which sustains their life.  From Tome and Blood Requirements:
Alignment:
Non-lawful
Heal: 4 ranks
Feats:  Toughness
Spells: Ability to cast arcane spells of 3rd level
Special: Must have died and returned to life through Raise Dead or other similar life returning methods.