Arkham Horror LCG: City of Archives (The Forgotten Age 4)

There is reason to hope that my experience was wholly or partly an hallucination—for which, indeed, abundant causes existed. And yet, its realism was so hideous that I sometimes find hope impossible. I urge, with all the force of my being, a final abandonment of the masonry which my expedition set out to investigate.
  –H.P. Lovecraft, “The Shadow out of Time”