This page includes all of the specific details of the selected feat as well as the Section 15 entry of the OGL for the product from which the feat comes. Feats listed in the Prerequisites section should be linked as well.
Your spells carry an embedded curse that manifests when they strike true.
Critical Focus, ability to cast bestow curse or major curse, caster level 9th.
When you confirm a critical hit with a spell or spell-like ability, you may cast bestow curse or major curse on that target as an immediate action. This works even with ranged spells. You must have bestow curse or majorcurse prepared or otherwise available to cast, and using this ability casts the corresponding spell.