Developed by Iron Lore Entertainment, Titan Quest: Immortal Throne features a rich, original storyline with more than 12 hours of single-player content per difficulty level. New game-play features include an all-new skill mastery that combines with existing masteries to form eight new playable character classes. Titan Quest: Immortal Throne also adds dozens of terrifying new monsters, hundreds of unique weapons and an additional 10 levels of character and skill development.