Overlord is a commercial, almost completely combat oriented downloadable content (DLC) pack for Mass Effect 2. An AI named "VI overlord" has gone rogue, attacks Cerberus bases and unleashes Geth. Of course Shepard has to shut it down... The quest series leads the player to five new areas which partly include the usage of the Hammerhead which was introduced in the Firewalker Pack DLC. There are also two new achievements which are earned by finishing the quest series and solving a side quest which includes finding heavily armed data packs.