Exorcism Herbs

Frankincense was used in French hospitals during times of plague to exorcise the "demons" that were making everyone so sick. Because of it's historical use and the belief surrounding it, frankincense is a very good exorcism incense.

For exorcism herbs I find a combination of a protection and purifying/"holy" herb with a controlling herb works best. That should give you a good amount of freedom instead of a treasure hunt.