Apostasy Prologue

 is an optional quest released in. An abruptly intruded quest, this questline relives Margulis' final moments with Ballas before being executed.

Walkthrough

 * WARNING: The walkthrough ahead contains significant spoilers to Warframe's lore. It is recommended to play through the quest first.

In order to unlock this quest, the player must have first completed the Chains of Harrow quest, as well as have access to their Orbiter's Personal Quarters.

After the player enters the Personal Quarters, a blue and purple orb can be seen floating at the end of the room near the port window. Approaching the orb and pressing the prompted action button will take the player to the loading screen.

The player will be transferred to the Orokin Moon to find yet another orb. This time, approaching the orb will reveal a purple trail that will lead the player through the map. While following the trail the player will hear past dialogue between Margulis and Ballas before Margulis' execution.

At the end of the trail is a broken Reservoir where the player will jump down and be forced to enter Operator mode.

There, the player will hear echoes of the last few moments leading up to Margulis' execution and find a pod at the end of the hall, where a cutscene will play.

As the pod opens it's revealed that the Lotus resides inside. The Lotus extends a greeting, and the Operator is startled to see Ballas in person standing behind themselves. Ballas then steps forward and apologizes to the Lotus for being gone for so long. The Lotus insists that she is not Margulis, but Ballas insists and reaches out his hand. A wave of energy flows out and the Lotus is detached from the pod.

The Lotus then removes her mask and takes Ballas' hand. Both Ballas and the Lotus walk into a blinding light away from the Operator. Attempting to follow Ballas, the player is knocked back by a shockwave instead.

After the Lotus and Ballas disappear the Operator takes the Lotus' dropped mask.

Back at the Orbiter, Ordis states that he will search for the Lotus' current whereabouts, and in the meantime synthesize the Lotus' order directives.