The Sacrifice is Warframes latest DLC, and will have players going toe-to-toe with the vengeful Umbra. The DLC is free to all and will become available after completing The Second Dream, The War Within, Chains of Harrow and the Apostasy Prologue. Get your hands on it this week!
Source: Shacknews E3 2018: Warframe Quest "The Sacrifice" Available This Week