"Immortal Throne" is an expansion for the action role-playing game Titan Quest, originally released in 2006. It introduces new content, including additional quests, enemies, and character classes, enhancing the gameplay experience. Players can explore new regions inspired by ancient mythology, particularly focusing on the Underworld and the Elysian Fields. The expansion also features a new mastery system, allowing players to combine different skills for unique character builds. With improved graphics and gameplay mechanics, "Immortal Throne" offers both new and returning players an enriched adventure in the world of Titan Quest.