Image: Rebel Wolves / Bandai NamcoNo screenshot of Sacred Covenant yet. This one shows Brencis (Rebel Wolves / Bandai Namco).
Sacred Covenant is the fourth main quest of the prologue, the Blood Mass in Laslea's church. What you did earlier, especially with Esme's herbs, decides how it plays out, so it is the moment the prologue pays off.
Once Like Father, Like Son is done, you have until sunset. Use the time for side quests, then go to the church. Talking with villagers before the Mass is optional and mostly adds a chat with Anca.
1. Wait for sunset or return to Pieter. 2. Talk with villagers (optional). 3. Sit in the pew beside Pieter and Esme.
The herb dose you gave Esme in Withering Away decides her fate when the vrakhiri arrive. A wrong dose gets her killed, and the right one only draws their attention. Your outcome in Blasphemy changes what hangs above the altar. Brencis's hand bleeds during the ceremony. Then Pieter and Vladimir seize the silver mine and Coen is knocked out.
Image: Rebel Wolves / Bandai NamcoPrologue
The prologue is the opening part of the story. It is set in Laslea, before the open world unlocks. Every side quest here is missable, so do them before the Blood Mass.
Image: Rebel Wolves / Bandai NamcoFall Before Dusk
Fall Before Dusk is the ending quest of Crake's questline, a rebel assault on Greifberg Castle that ends with Brencis. Beat him for The Knyazmaker, or bargain with him for The Turncoat.
Image: Rebel Wolves / Bandai NamcoA Deal with the Devil
A Deal with the Devil is the final main quest, where Brencis asks you to parley at Shrike's Crag. Your choices here decide which ending you get, so make a manual save before you go.
Image: Rebel Wolves / Bandai NamcoAll Good Things
All Good Things is the opening quest, where you chase Lunka through a canyon and learn the basics of combat. It teaches parrying, vampire form and Shadowstep before the story proper begins.