This rambling manuscript is written on vellum pages in faded ink. The handwriting is erratic and hard to read, filled with crossings-out, corrections, and marginal notes. The content is similarly difficult to follow, having been written by a half-crazed man dying from a fever. The text tells of an ancient horror imprisoned in a pyramid in the Andean Highlands and the secrets it has shared with those who came under its thrall. The author, Gaspar Figueroa, remained free of its control and his writings are filled with terror and loathing for the secrets he has learned.