From publisher blurb:
A Desperately Needed Fix for an Awesome Concept
The Occult Adventures rulebook for the Pathfinder Roleplaying Game is in desperate need of a rewrite.
Making a Fortitude and Will save every round, which gets prohibitively difficult in extremely short order, with the "swinginess" of a d20, was not a viable option.
Further, with the given difficulty, the power granted in exchange is short in duration and extremely underwhelming.