Dishonored Death of the Outsider All Endings (Good & Bad) - Final Release & Deicide Trophy / Achievement Guide - Return the Outsider to the mortal world & Kill the Outsider [2 x Gold / 2 x 50G]

Mission 5
Good Ending (Final Release Trophy): After interacting with the black eye in the cave halfway through mission 5, you will enter the void. From the eye, turn around and look for a corpse on some spikes. Loot the key from the corpse. This triggers a new optional objective called "Inspect Malchiodi's Lodging". Quite simply mark it in your quest log and disable the markers for other objectives to see it more easily. The marker will guide you to a room that can be opened using the key. Inside the room there's a chest. The keycode is 962. Read the book from the chest to complete the objective. Now move on to the main objective (go to the Ritual Hold). When you reach the Outsider, make a manual save. You can reload this later to do the opposite ending. Inspect the Outsider's body (press Square) and then talk to Daud a few times. Always choose the non-lethal dialogue option to let the outsider live. After talking to Daud a few times he will walk over to the Outsider and release him. This gives the good ending and Final release trophy.

Bad Ending (Deicide Trophy): Once you reach the outsider, simply perform a melee attack on him. This kills him instantly. If you made a manual save during the Final Release trophy you can reload it after the final cutscene. For the bad ending you don't have to go through the optional objective.