Here is a list of all the classes in Titan Quest Immortal Throne. Your class name is determined by which two classes you combine.

Dream Mastery [Immortal Throne Only]

• Single Profession: Seer
• + Storm Mastery: Prophet
• + Earth Mastery: Evoker
• + Warfare Mastery: Harbinger
• + Spirit Mastery: Diviner
• + Defense Mastery: Templar
• + Nature Mastery: Ritualist
• + Hunting Mastery: Haruspex
• + Rogue Mastery: Dreamkiller

Storm Mastery

• Single Profession: Stormcaller
• + Earth Mastery: Elementalist
• + Warfare Mastery: Thane
• + Spirit Mastery: Oracle
• + Defense Mastery: Paladin
• + Nature Mastery: Druid
• + Hunting Mastery: Sage
• + Rogue Mastery: Sorcerer
  

Earth Mastery

• Single Profession: Pyromancer
• + Warfare Mastery: Battlemage
• + Spirit Mastery: Conjurer
• + Defense Mastery: Juggernaut
• + Nature Mastery: Summoner
• + Hunting Mastery: Avenger
• + Rogue Mastery: Magician

Warfare Mastery

• Single Profession: Warrior
• + Spirit Mastery: Spellbreaker
• + Defense Mastery: Conqueror
• + Nature Mastery: Champion
• + Hunting Mastery: Slayer
• + Rogue Mastery: Assassin

Spirit Mastery

• Single Profession: Theurgist
• + Defense Mastery: Spellbinder
• + Nature Mastery: Soothsayer
• + Hunting Mastery: Bone Charmer
• + Rogue Mastery: Warlock

Defense Mastery

• Single Profession: Defender
• + Nature Mastery: Guardian
• + Hunting Mastery: Warden
• + Rogue Mastery: Corsair

Nature Mastery

• Single Profession: Wanderer
• + Hunting Mastery: Ranger
• + Rogue Mastery: Illusionist

Hunting Mastery

• Single Profession: Hunter
  
• + Rogue Mastery: Brigand
  

Rogue Mastery

• Single Profession: Rogue