On sims medieval how do you use the Purge Demons spell?

Answer 1

Someone on EA forums have the answer.

http://forum.ea.com/eaforum/posts/list/5497949.page

Answer 2

Here's the actual answer for your convenience

"Make sure the Priest is the selected Sim and then click on him/her, there should be an option that says something about revealing possessed villagers (can't remember exact wording now, when I played it was the bottom option).

After the Priest has identified the villagers, select the Wizard and then click on a villager and cast spell, Purge Demon will be the only option."

Answer 3

When I was trying to use it I had to select the mage, memorise the spell then go and cast it on the priest. So 1) I didn't need to have the priest as the selected sim 2) the priest had no option whatsoever for 'finding possessed villagers' or whatever...