If the target of this ritual is undead, it is incapable of regeneration effects and reanimation effects while this ritual is being cast. In addition, any regeneration effects or reanimation effects that target them during Fizzles during this time.
When this ritual is completed, make a priest check to see if the undead target is destroyed. The check's DC is typically equal to the battle rating of the target's undead type. The GM may adjust the DC based on other factors as they see fit.
Exorcism can also be used to cleanse effects other than being undead. The GM decides the DC of the priest check based on the severity of the effect being cleansed. If the check is successful, the effect is removed and the target is destroyed in a similar manner to an undead target. The target pulls stones from the Death Bag based on the severity of the effect being cleansed (see GM).