List of Locations
Unlike the World of Light, chapters are named thematically rather than by location name. Many of the locations found in the World of Darkness are recreations or transplants of locations from individuals' original homeworlds.
After the destruction of the Crystal of Light, the Crystal of Darkness takes on the burden of maintaining both halves of the World of Respite. Materia warns that it can only uphold both worlds for a certain amount of time and it is necessary for the summoned warriors to remake the Crystal of Light. In order to do so, they must recover the Brilliance sequestered in the Dark Manikins. The Brilliance contains not only light, but painful memories which Materia removed from her summoned champions in the belief that they could not achieve respite unless she did so.
However, as the Brilliance is a significant source of energy, numerous villains who remain opposed to Mog's party also seek it for their own ends. As the party traverses the landscape of this new world, their foes begin to use the power of will to recreate places from their homes, starting with Kuja's attempt to summon the Iifa Tree.
In each new place, party members from different worlds encounter the Dark Manikins of themselves. Although the memories give the Dark Manikins sentience and purpose, their lack of true emotions makes them vulnerable to manipulation by the party's foes. Some Manikins are manipulated emotionally with the memories they carry, while others are possessed and used as an energy source for destructive goals. As a result, reuniting with the Manikins long enough to regain their Brilliance proves to be a struggle for the party. For some, however, it is their own reluctance to relive the pain of those memories that delays them.
The strain on the core of darkness eventually reacts with the memories of Spiritus' warriors that he had sequestered in it, as he had removed their memory of the powerful forms they used in their final battles. The arrival of Ardyn Izunia accelerates this, as his strong affinity with darkness resonates with the Core. Ardyn manipulates many of Spiritus' warriors in order to use this power to destroy all worlds in defiance of the gods. He is interrupted during a battle with Noctis and the others when Shinryu emerges and swallows the crystal whole.