You can make a creature that fails its spell save suffer your jinx as well.
Benefit: Any creature that fails its saving throw against a jinxed spell also suffers the effects of your jinx. This feat has no effect on spells that do not allow a saving throw. If the spell affects an area or multiple creatures, you must select one creature to take the jinx, unless you have the Area Jinx feat; if you have the Area Jinx feat, choose a jinx burst area within the spell’s area or among its targets and apply the jinx to those in the burst that failed their save.
Level Increase: +1 (a jinxed spell uses up a spell slot one level higher than the spell’s actual level.)