Tenebris Somnia Endings — How to Unlock All Four

Tenebris Somnia has four endings: two main endings unlocked during a single run, and two secret endings unlocked after both main endings have been seen. The endings persist on your Steam profile as four achievements: SOLVE ET COAGULA, MAGNUM OPUS, VIVUS EX MORTIBUS, and RENUNTIATIO.

Ending #1 is also called Lacuna. It's the "good" ending and it's the result of a single deliberate choice after the Aurifer Knife chain.

1. Forge the Aurifer Knife via the Desiderium chain (Lapis Fictus → Melanosis → Virdis → Aurifer). See knives for the steps.
2. After the Aurifer is collected, do not kill the Relicta ghosts with it.
3. Sprint past them through the Hotel doors back to the Studio Lobby, exit to the hallway, take the furthest-right door to the staircase, climb to Floor 3, enter the apartment hallway, far left go through the door with the water puddle, then left in the street to the Séptimo Arte building with the Relicta ghosts and enter the building.
4. The final boss fight (Lacuna) plays. During Lacuna Phase 1 you can deliberately stay still to get grabbed and die — that earns the missable Acrophobia achievement.

The full sprint route from Aurifer to Séptimo Arte is on the full walkthrough; see the "Ending route" section.

Ending #2 is also called Hermes. Same start as the Good ending — forge the Aurifer and exit the Aurifer room — but this time you kill Relicta ghosts with the Aurifer Knife along the route to Séptimo Arte.

1. Forge the Aurifer Knife (same as Good ending, step 1).
2. Kill several Relicta ghosts with the Aurifer on every floor along the route to Séptimo Arte — not just the ghosts directly on the path. The Aurifer is the only weapon that reliably hits Relicta ghosts.
3. To cleanly max out the kill count for the Heart of Lead achievement (kill Relicta ghosts on every floor), avoid multikills and wait for the gold particles to clear between each ghost before swinging again.
4. Continue to the Séptimo Arte building for the final boss (Hermes). During Hermes Phase 2 you can deliberately walk into the boss's mouth to die — that earns the missable Devoured achievement.

The same save before the Aurifer Knife can branch into both endings: reload after the Aurifer to pick Good or Bad without redoing the run.

Ending #3 is a secret ending. It only becomes available after both Endings #1 and #2 are saved on your profile.

1. Start a fresh run and pick up the book** (this is the §De Relictis** achievement: read every page of the Old Book before the game ends).
2. Use the bible on three spots, following the symbols shown:
   • the TV static screen
   • the Community Center reels
   • the Floor 0 green door (cycle the camera 6 times)
3. Collect the inverted red crosses that appear and place them outside the Séptimo Arte building.
4. The Ending #3 cutscene triggers.

De Relictis must be earned in this run, otherwise the run does not count toward unlocking Ending #3.

Ending #4 is also a secret ending and also requires Endings #1 and #2 to be saved on your Steam profile first.

1. Start a fresh run.
2. Instead of progressing through the building, use the keys you already have to leave the apartment complex immediately.
3. The Ending #4 cutscene plays.

De Relictis still has to be earned in this run for it to register.

The Aurifer Knife is the only weapon that hits Relicta ghosts. For Ending #2:

• Kill Relicta on every floor on the way to Séptimo Arte, not just on the path → unlocks Heart of Lead in the same run.
• Kill only the ghosts directly in your path → Ending #2 plays but Heart of Lead does not pop.

Multikills can skip the kill-counter registration; let the gold particles clear before each swing.

• Acrophobia — die during Lacuna Phase 1 (Good ending) by staying still during her scream-jump-land.
• Devoured — die during Hermes Phase 2 (Bad ending) by walking into the boss's mouth.
• Heart of Lead — Relicta kills on every floor, only on the Bad ending route.

These must be done deliberately during the relevant run. Plan them in separate sessions and branch from the post-Aurifer save. The full checklist is on the achievements page; combat loadout rules apply on combat strategy.