Player-Initiated Collapse
Mid-session, the rogue says: “I know a guy in the Miners’ Guild. Old contact from before I joined the adventurers.”
In a traditional game, the GM either says yes or no. In the Pandemonium Engine, the player is pinning a node — declaring that a specific entity exists in the people layer, with specific posts (relationship to player, Miners faction affiliation). This is a player-initiated collapse.
The engine handles it:
-
Check observed canon. Does this pin contradict anything the players have already seen? If the party met the Miners’ Guild leader last session and it’s someone else, “I know the guy who runs the guild” fails. “I know a guy in the guild” doesn’t.
-
Find the lowest-entropy match. The engine doesn’t create a new NPC from nothing. It looks at every uncollapsed person-node with a Miners post and picks the one with the fewest remaining possibilities — the most constrained, most interconnected node that could satisfy the declaration.
The least-entropic node is always the most interesting one. It’s the NPC who was already almost-real — sitting at the intersection of the Miners faction, the building adjacent to the quest-relevant mine, and the structural dissenter role that faction cardinality demands. The system hands the player the NPC who matters most, not a random nobody.
“I know a place” works identically. The rogue’s safehouse isn’t random building 37. It’s the building most constrained toward being a covert location — isolated from faction buildings, adjacent to the docks, in the shadow between two competing territories. The graph picked it. The rogue just observed it into existence.
The GM as Constraint Referee
The GM’s role shifts. They’re not deciding whether the fiction allows a player’s declaration. They’re checking whether observed canon permits it. Everything unobserved is permissive by default.
If it hasn’t been observed, it can be true. The GM only says no when a pin contradicts hard canon. Otherwise, the answer is always some version of yes — the engine finds a place for it.
This is a direct extension of the collaborative authorship principle. Players aren’t just consumers of GM-generated content — they’re co-authors pinning the world into existence through their declarations.