From Pathfinder Lost Omens Tian Xia Character Guide, which isn't enabled.

Sheltering Jewel

FEAT 13

Your head gem has accessed the power of the full moon through your determination to heal and protect your loved ones. You can cast Vital Beacon as a 5th-rank innate occult spell once per day, so long as you possess your head gem.

Pathfinder Lost Omens Tian Xia Character GuideORC