From publisher blurb:
The knowledge of one’s own mortality is often learned from a young age, and for many this knowledge inspires a looming dread over the remainder of one’s life. For some, this looming dread sparks motivation to overcome, an obsession to surpass their frail mortal form. This obsession with mortality drives each individual to their own goals, seeking a wide variety of methods to alter their body, extend their lives, or cast off their original flesh entirely. This book contains recordings of a number of those methods and information on those who would accomplish them.
Eldritch Akasha: Obsessions of Mortality expands on the Akashic Magic subsystem for PF1e with brand new options themed around altering ones own body with flesh warping magics!
Contained within this books is a reprint of the core chassis of the Promethean, new promethean Obsessions and Forbidden Knowledge, new archetypes for the Eclipse, Promethean, and Radiant, new class features for the Daevic, Nexus, and Vizier, new variant heritages for the Avead, brand new feats, and a suite of new fleshwarp veils!
This book heavily features the Promethean, originally made available in Eldritch Essences: Promethean published by Lost Spheres Publishing. This book contains the core chassis of the class, but does not feature any of the Favored Class Bonuses, Obsessions, Forbidden Knowledge, or Veils printed in that book. This book provided you everything you need to play a promethean, but the options provided to you will be more limited than when using both that book and this book together.