Jolting Portent

The creature you designate is surrounded by a glowing red aura of vengeful fate. Once per round when the target makes an attack or casts a spell, it must succeed at a Fortitude saving throw with a DC = 10 + 1/2 caster level + spellcasting ability modifier. If the target fails the saving throw, it takes 4d6 + your spellcasting ability modifier electricity damage. It takes no damage on a successful saving throw.