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From Pathfinder Season of Ghosts Hardcover Compilation, which isn't enabled.

Unbreakable Resolve

FEAT 13
Activity reaction

Frequency once per 10 minutes
Trigger You fail a Will save.

The experience of coming back after death has granted you a strong sense of resolve; devilish words, slick spells, and conniving trickery can't easily catch you unprepared. Reroll the triggering save, using the second result only if it's better.

Pathfinder Season of Ghosts Hardcover CompilationORC