Fire lives at the center of the world, the center of the sun, and the center of civilization. You might revere this elemental force, siphon power from the Elemental Plane of Fire, or venerate a collection of deities such as Asmodeus, Sarenrae, the Tian goddess of disasters and volcanoes Lady Nanbyo, or the elemental lord of fire Ymeri. You aren't quite sure where your power comes from, but you get the sense it was given to you for a reason.
Drawing on multiple disparate sources of power inevitably places an incredible stress on your body, manifesting as a supernatural curse. The more revelation spells you cast, the worse the effects of your curse, but these increasingly conflicting energies can also provide you with divine benefits.
The specific effects of your curse are tied to your mystery, but all curses follow the same progression. A curse continually gives you a mild but constant reminder that you carry otherworldly power. As you cast revelation spells, your curse intensifies, first to a minor effect and then to a moderate effect.
Your curse progresses to its minor stage the first time you finish casting a revelation spell after your daily preparations. Once your minor curse has manifested, it remains in effect until you rest for 8 hours and again make your daily preparations. If you cast a revelation spell while your minor curse is in effect, you progress to the moderate curse effect immediately after you finish Casting the Spell. The minor effect continues to affect you, though some moderate curse effects might alter the specifics of your minor curse. At higher levels, you can cast more revelation spells, progressing your curse to its major stage and then an extreme stage; these stronger curses are cumulative with the effects of the lower stages and can alter them. When you Refocus while under the effects of your moderate or stronger curse, you reduce your curse's severity to minor in addition to regaining a Focus Point.
Drawing upon your mystery's power while your curse is at its worst causes an irreconcilable conflict between you and the sources of your power. Immediately after casting a revelation spell while under the moderate effect of your curse, you are overwhelmed. While overwhelmed, you can't Cast or Sustain any revelation spells— you effectively lose access to those spells. You can still Refocus to reduce the effects of your curse and regain a Focus Point, but doing so doesn't allow you to cast further revelation spells. These effects last until you rest for 8 hours and make your daily preparations, at which point your curse returns to its basic state. At higher levels, you can grow to withstand your curse's major and even extreme effects, enabling you to cast more revelation spells without becoming overwhelmed.
Your curse has the curse, divine, and necromancy traits. You can't mitigate, reduce, or remove the effects of your oracular curse by any means other than Refocusing and resting for 8 hours. For example, if your curse makes creatures concealed from you, you can't negate that concealed condition through a magic item or spell, such as true strike (though you would still benefit from the other effects of that item or spell). Likewise, remove curse and similar spells don't affect your curse at all.