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Mage of the Arcane Order - Also called a 'guildmage' this is a spellcaster who belongs to the academy and guild known as the arcane order.  From Tome and Blood Requirements:
Knowledge (Arcana):
8 ranks
Feats: two metamagic feats, one which must be Cooperative Spell
Spellcasting: Ability to cast arcane spells of 2nd level
Special: Must have paid the initiation fee of the arcane order.
Master of Shrouds - An evil spellcaster who magically seizes incorporeal undead and sets them to do her bidding. (from Defenders of the Faith) As an evil prestige class, Master of Shrouds is not available for PC's in the Stormkeep Campaign.
Master of Chains - A combatant specialized in the use of chains. Not currently available for pc's in the Stormkeep Campaign, under consideration.
Master Samurai - Military retainer of a feudal overlord, the Samurai practices a personal code of behaviour emphasizing personal honor over life itself.  (from S&F) Requirements:
BAB: 
+5
Knowledge (nobility and royalty):
4 ranks
Ride:
4 ranks
Intimidate: 
4 ranks
Feats:
Cleave, Improved Initiative, Mounted Archery, Mounted Combat, Power Attack, Weapon Focus (bastard sword).

 

Metamind - A metamind knows that accumulating the most power in the shortest amount of time is the key to psionic superiority.  (From Psionics Handbook) Requirements:
Manifesting:
Ability to manifest 2 different powers, one which must be of level 2 or higher.
Psicraft: 6 ranks
Knowledge (psionics): 6 ranks
Feats: Inner Strength
Mighty Contender of Kord - An unusual mixture of athletic mysticism, contenders are worldly, frequenting public baths, gymnasiums, or taverns while expounding their philosophies of spritual and physical liberation and demonstrating their feats of incredible strength.
From Dragon #283
Requirements:
Alignment:
Chaotic Good
Patron Deity: Kord
Base Fortitude Save: Knowledge (religion):  9 ranks
Feats: Endurance, Power Attack
Spellcasting: Ability to cast divine spells
Mindbender - Mindbenders seek to control the thoughts and dreams of others. From an early age, those destined to walk this path learn little tricks and manipulations to get their way.  From Tome and Blood Requirements:
Bluff:
4 ranks
Diplomacy: 4 ranks
Intimidate: 4 ranks
Sense Motive: 4 ranks
Feat: Leadership
Spells: Ability to cast arcane spells of 3rd level
Mystic - Spellcasters who focus solely on the pursuit of magic, mystics' hard work and study reveal to them secrets of magic unavailable elsewhere. (from Dragon #274) Requirements:
Spellcraft:
10 ranks
Knowledge (Arcana):
10 ranks
Knowledge (religion):
5 ranks
Feats:
Spell Penetration, Spell Focus, one metamagic feat, and one item creation feat.