You've dedicated yourself to a deity or pantheon. As long as you follow the edicts and anathema of that deity, you gain their granted 1st-rank spell as a divine innate spell you can cast once per day, heightened to 3rd rank; if you're legendary, the spell is heightened to 4th rank. If you repeatedly break your deity's edicts or perform anathemas, you lose this ability, and it can only be regained with an
atone ritual.