Not sure about exorcisim, but Warding is a catch all art on so many levels.  For example, if you have initiate degree of warding, you have several iniate degree procedures in multiple other Colleges--including The Dead/Demons/Elementals/Spirits and even Husbandry.  You can alos use your knowlege of Warding combined with mastery of Enchantent to create charms that ward a specific person agains tthings like disease, specific creatures of darnkess, etc.