Eldritch Fever

This spell provides and additional option to the bestow curse spell

• Eldritch Fever. This curse manifests itself as a sickness that is debilitating to spellcasters. A spellcaster with this curse is sickened until the curse is removed suffering a -1d4 penalty on ability checks, skill checks and saving throws. When the subject of the curse casts a spell, it is overcome with shaking for 1 round, requiring any spellcasting during that time to succeed at a Constitution check as if they were concentrating on a spell. If it fails the save, the spell and the action to cast it is lost.