All endings in Tenebris Somnia and how to unlock them

Tenebris Somnia has four endings: two available on a first playthrough and two that require a new game after completing the first pair. The endings depend on whether players spare or kill Relicta ghosts and, for the later endings, follow specific Bible-related steps.

With the Aurifer knife, sparing every Relicta ghost leads to Solve Et Coagula, while killing at least one leads to Magnum Opus. For the third ending, start a new game after unlocking both, collect the Bible and use it at several locations: perform the six counterclockwise turns before the TV puzzle, enter 6666 at the Community Center lock, and use the Bible with the camera before entering the Copper Key door. Then insert three Iron Crosses through the blue door on the third floor. The fourth ending also requires both initial endings and is reached by using the Apartment keys on the door.