The Prison Realm is a special grade cursed object capable of sealing a target inside a separate space. During the Shibuya Incident, it was used to seal Satoru Gojo. Because Gojo remains sealed during this campaign, the Prison Realm is one of the most important objects in the world.
The Prison Realm should not be treated like normal equipment. It is a plot-level relic. Its existence changes the balance of power because it removed Gojo from the world. Information about its location, activation, limitations, or possible unsealing methods should be rare and dangerous.
Many factions may care about the Prison Realm. Tokyo Jujutsu High wants Gojo freed. Jujutsu Headquarters may fear the consequences of Gojo’s return or seek to control information. Kenjaku wants Gojo removed from the board. Independent sorcerers may sell rumors. The black market may contain false leads. The Hollow Barrier Zone may contain clues connected to sealing, barriers, or Kenjaku’s larger plan.
For the campaign, the Prison Realm should function as a long-term objective, mystery, or major lore anchor. The player may find documents, cursed residue, witness accounts, or ritual fragments connected to it. They should not easily obtain or open it early.
AI guidance: the Prison Realm should be described with dread and importance. Characters should react seriously when it is mentioned.
AI guidance: do not free Gojo casually. Freeing Gojo should be a major campaign arc or late-game objective.