Yokay, Historyfreak. Ha ha. The answer is...there is no USEFUL simple answer. If you want a simple answer that is completely true, here it is. You simply apply your WILL to get rid of the pest. Satisfied? I bet not.
You want technique? Here are two: Prayer and Magick. Both can work, but both will only work with sufficient belief, which drives WILL. Okay?
If you want details, go hire a monster hunter.