Dungeon Siege III (DSIII or DS3) is an upcoming action role-playing game to be developed by Obsidian Entertainment and published by Square Enix for the PlayStation 3, Xbox 360 and Microsoft Windows. Chris Taylor, the original creator of Dungeon Siege will serve as an advisor during the development of the game. This is the third game in the series not to be developed by Gas Powered Games, (after Dungeon Siege: Legends of Aranna by Mad Doc Software and Dungeon Siege: Throne of Agony by SuperVillain Studios) and the first to be published by Square Enix after it acquired the complete ownership of the Dungeon Siege franchise and is due to be released in 2011.
The game will be returning to the Kingdom of Ehb and focus on the 10th Legion. The legionnaires protected Ehb during the War of Legions and at the end of the war, the commanders of the 10th Legion established a new and independent kingdom of Ehb. The Legion continued to provide stability and protection while the ruler-ship of the kingdom was left to the monarchy.
The Legion became powerful with its influence matching the monarchy. Thirty years ago, the Ehb's king was murdered and the blame was cast upon the Legion.