1-4. The Bestow Blessing & Curse spell will be barred from the petitioner for the next 1d3 days. Similar spells may still work (a 66% chance), though they remain subject to their own divine tests.
5-12. Forsooth, the next blessing or curse the petitioner casts is reversed. A target intended blessed is now cursed with the opposite effect. Vice versa for the one to be so cursed. Boon and bane shift by the judgment of the gods.