Ill Omen
Spell 1CurseDivinationMisfortuneSource Gods & Magic pg. 108,
Advanced Player's Guide pg. 221;
There is a more recent version of this spell. Click here to view.Traditions occultCast 
somatic,
verbalRange 30 feet;
Targets 1 creature
Duration 1 round
The target is struck with misfortune, which throws them off balance. The target must attempt a Will save.
Success The target is unaffected.
Failure The first time during the duration that target rolls an attack roll or skill check, it must roll twice and take the worse result.
Critical Failure Every time during the duration that the target rolls an attack roll or skill check, it must roll twice and take the worse result.