The Lord of the Rings Online: Siege of Mirkwood is a 2009 expansion for Turbine's massively multiplayer RPG set in Middle-earth, released as a digital download for Windows. It concludes Volume II of the game's ongoing narrative, sending players eastward into the dangerous forest of Mirkwood and toward the infamous fortress of Dol Guldur. The expansion raises the level cap and introduces a new region centered on that stronghold. Combat and the Legendary Items system both receive significant updates. The headline addition is Skirmishes, a new gameplay mode in which players train and customize soldier companions, then deploy them in battles tied to the broader War of the Ring. The expansion is designed around cooperative play, encouraging groups to push through Mirkwood's hostile territory together as part of the larger conflict unfolding across the game's world.

Storyline

Mirkwood - Once it was Greenwood the Great, and men and Elves lived in peace beneath its boughs... until the Necromancer's Tower arose, stirring a great evil in the forest's heart. Now death and darkness thicken the forest air, stifling life and twisting the green, growing things. To this dark and foreboding place, Lord Celeborn of Lothlórien send the Malledhrim, the Golden Host. Their purpose is to harry the armies of Dol Guldur, fortress of the Ringwraith known as the Lieutenant of Dol Guldur, right hand of the Witch-king of Angmar and keep them from growing stronger, but more importantly... to mask the passage of the Company of the Ring from the eaves of Lothlórien, turning the eyes of the Nazgûl upon themselves and away from Frodo Baggins and his companions. Join the Malledhrim as they lay siege to the tower of Dol Guldur and confront the Lieutenant upon his own threshold.