Many religions took this form prior to the Awakening of the Gods.
An oracle wields divine power, but not from a single divine being. This power could come from a potent concept or ideal, the attention of multiple divine entities whose areas of concern all touch on that subject, or a direct and dangerous conduit to raw divine power. This is the oracle's mystery, a source of divine magic not beholden to any deity.
Your conduit to divine power eschews the traditional channels of prayer and servitude—you instead glean divine truths that extend beyond any single deity. You understand the great mysteries of the universe embodied in overarching concepts that transcend good and evil or chaos and law, whether because you perceive the common ground across multiple deities or circumvent their power entirely. You explore one of these mysteries and draw upon its power to cast miraculous spells, but that power comes with a terrible price: a curse that grows stronger the more you draw upon it. Your abilities are a double-edged sword, which you might uphold as an instrument of the divine or view as a curse from the gods.
Your mystery might represent a pantheistic devotion to all the deities with power over the subject of your mystery, veneration of a particular ideal, or a conduit to raw divine energy. Whatever its origin and nature, your mystery determines the revelation spells you can cast and the oracular curse that overtakes your body when you do. You learn skills related to that mystery, gain access to a cantrip, and gain a special benefit drawn from the combined divine knowledge and experience of your mystery.
