You will need to engineer seven distortions to complete Chapter 12, though their exact locations can be tough to find. You will have to build up karma by attacking villagers and performing Witch Domination on several buildings, all without the Marginal Gaze facet equipped since it prevents you from gaining karma. As you gain karma, you can return to familiar maps and trigger cutscenes, which occasionally include battles and which always end with a fight with a monster known as The Editor (its exact form and attacks vary). Go to the following locations to trigger a new scene and face The Editor. Note: the final event in Castle Gate requires that you first complete the six prior events:
HOW TO TRIGGER
Near St. Dulche
Go to the house near the far northwest corner of the map, which was previously blocked by a level 38 anti-magic boulder.
Approach the alleyway on the right side of the map multiple times to trigger a series of scenes leading up to a boss fight.
Go to Lucchini's home village, Hidden Astaro, near the northeast corner of the map. You will trigger an event near the well.
Go to the Witch's Garden area, most easily accessible from the far northwest pillar.
From the Select Pillar, start up the stairs just to the left.
Go to the hut where you found the medicine man previously. The scene is triggered just east from there. You may need to raid the hut first.
Head north through this area and if you have sufficient karma and have met the requirements, the final scene follows.
There are three different possible endings and each unlocks a different trophy. Note: those going after every trophy should note that nearly a quarter of the trophies are available only if you achieve the "Bad" ending:
HOW TO UNLOCK
If prior to completing Chapter 11, you defeat three powerful optional bosses (located in the Ominous Cavity, Cicite: Reverse, and Old City Ruins maps), you will then access two final chapters loaded with content that leads to the final available ending.
Toward the end of Chapter 11 you will be asked if you want to aid Metallia. If you select the negative answer and then continue to make that choice when prompted, you will be treated to a brief ending.
Agree to assist Metallia, then proceed through the remainder of the chapter to receive the "True" ending.