Blind Path Cultist Style is a collection of 14 books that make up part of the Crafting Motifs library. Reading these chapters allows access to the Blind Path Cultist Style for crafting. Chapters (or rarely the entire book) are a possible drop from the Blind in the Bedlam Veil on Normal or Veteran mode. Chapters are a guaranteed drop in Veteran Hard Mode.
Learning all 14 crafting motifs earns the achievement Blind Path Cultist Style Master.