Most current designs still assume investigators are primarily ‘receivers’ of Carcosa’s influence; what changes if you generalize them as co-authors who can deliberately imprint their own obsessions, symbols, and mask-personas into the play and the Yellow Sign—how would that shift clue structure, faction design, and endgames when player-created motifs can propagate through the setting as strongly as canonical Carcosan imagery?

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Answer

Treat PCs as co-authors: their motifs are as viral as the Yellow Sign. This mainly shifts three things: clues, factions, and finales.

  1. Clue structure
  • Motif slots: Prep some clue “slots” as blank motifs (a recurring image, line, or mask) the group defines in play. Later clues echo those motifs as strongly as canonical KiY.
  • Reflexive clues: Some evidence is about what the PCs already changed (a review quoting a PC’s improvised line; a crime scene showing their private symbol). Following clues means chasing their own authorship.
  • Dual tags: Each key clue gets 2 tags: [Carcosa] and [PC motif]. As PC motifs spread, more clues flip to carry both tags. Using them gives more leverage but higher SAN/identity pressure.
  1. Faction design
  • Adopters: NPC circles that pick up PC-made imagery (a troupe adopting a PC’s mask, a salon copying their sigil). They become mirrors and amplifiers of PC obsessions.
  • Interpreters: Critics, occultists, clinicians who treat PC motifs as texts to decode. They fight over what “the investigators’ version” of the play means.
  • Resisters: People trying to quarantine PC-authored changes (censors, archivists, ex-allies). Their goal is not just to stop Carcosa, but to stop this group’s strain.
  1. Endgames
  • Authorial ascendancy: The King in Yellow still “wins,” but via a script visibly co-written by PCs; the world bears their specific masks and symbols.
  • Self-erasure: PCs try to pull their motifs back out—destroy scripts, deface Signs, disown identities—trading personal loss for limiting their strain of contagion.
  • Split canon: Different factions stage or archive incompatible “PC cuts” of the play. The ending is choosing which authored version becomes the main reality lens.

Safety: Make authorship opt-in and collaborative; treat PC-imprinted madness/identity erosion as negotiated fictional tools, not surprise punishments.