Chimera Prologue

Chimera Prologue is a short main Quest released in, not found in the Codex until completion. The Man in The Wall, "masquerading" as the Lotus, "guides" the Operator to an Mutalist Ballas who relinquishes his Paracesis in preparation for their war with the Sentients

Walkthrough
In order to access this quest, the player must have first completed The Sacrifice quest.

The Orbiter: Personal Quarters
In the Orbiter's Personal Quarters, The Man in The Wall sits on the plinth that carries the Lotus's headgear, seemingly donning it, before vanishing. Approaching the headgear and touching it will transition the Tenno into the loading screen.

Lua: The Reservoir
After loading in, the player will be dropped onto Lua. They must follow The Man in The Wall, now wearing the Lotus's headgear. Three times during the chase, a barrier erects itself and the Tenno must ward off zombie-like apparations of The Man in The Wall.

The Tenno are lead to the Reservoir and drop down into a pit and are forced into Operator mode, falling into the chamber where they encounter the Lotus and Ballas during the Apostasy Prologue. At the end of the chamber is a portal that the Tenno must enter.

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The portal takes the Tenno to an Infested-like chamber. In this sequence, the player will no longer have control over their character, instead using the fire button to Void Dash toward a glowing light.

At the end of the chamber, the Tenno spots Ballas, now a Mutalist, rambling to himself. The player must now stay out of Ballas's sight by using numerous Void Dash points around the room. As Ballas rambles, several metal fragments fall in place in the middle of the room. Upon realizing the presence of the "devil", the pieces come together to form a sword and Ballas instructs them to take the Sentient slayer for their upcoming war, before looking away. As the Tenno dashes and grips the sword, Ballas abruptly turns to face the Tenno.

Epilogue
The Operator finds themselves back on the Orbiter, now in possession of the blueprint for the Paracesis.