Warframe: The War Within (2016)

The Grineer Empire grows stronger as a cryptic adversary surfaces. What secrets does the Grineer Empire keep? Underpowered, unprepared and forced out of your comfort, you must find it in yourself to improvise, not just to save yourself but the fate of all Tenno. The Queens' Fortress awaits, where both Warframe and Operator will be pushed past their limits as they slowly unravel mysteries about the Tenno's past and their true capabilities.