You discreetly conjure a number of flies equal to your spellcasting ability modifier to inhabit the hair or clothing of any creatures of your choice within range. Only one fly can be designated to any one creature at the time of casting this spell.
You can magically track the location of any fly-infested creature so long as they remain within 1 mile of you. If your infested quarry disrobes, the fly tries to stay in the creature's hair or, if unable to do so (such as if the creature has no hair or immerses itself in water), it instead stays in any of the creature's dry clothes or belongings.
Any time an infested creature searches its body or through its belongings, it can make a DC 15 Wisdom [Tooltip Not Found] check. On a success, the creature notices the fly and the fly dies, ending the effect on itself. After 24 hours, any remaining flies die, and the spell ends.