Robot Entertainment's Orcs Must Die! 2 was announced this morning, with the sequel adding the feature that was painfully absent from the original: cooperative gameplay. The sequel, which will be playable at this weekend's PAX East, welcomes the return of the doofy War Mage and adds the Sorceress, "who keeps enemies at bay with mind-control and magic."

"Only 3.4 billion orcs have been slaughtered to date," Robot Entertainment CEO Patrick Hudson declared this morning. "The only way we will get to a respectable orc death toll is by adding another killing machine and cooperative play. Bring a friend and destroy the orcs!"

The sequel adds a whole new campaign, more enemies, additional defenses and a new upgrade system. We look forward to hearing the call of orc slaughter and reporting back on our experience this weekend.