Your spells are used to take people as prisoners, and thus are meant to incapacitate.
Prerequisite(s): Spellcraft 1 rank
Benefit(s): When attacking someone with a damaging spell, you can choose to make it a Prisoner Spell. All of the damage is converted to nonlethal damage which knocks them out once they hit 0 HP. In addition once the target of this spell hits 0 HP they are bound in ethereal chains which bind them, and remain for 24 hours. These ethereal chains can be escaped out of with a DC 20 Acrobatics check, or broken through use of strength by making a DC 20 Strength check.
This ability only affects single target spells.