How to upgrade priests to inqusitors?

[Xargon]

A pain to use? Get into an easy battle (actually, it does not even need to be an easy one, you can use the sacrifice+time back combo when there are only a few enemies left).
Round 1: Sacrifice (two times if you have higher magic)
Round 2: The same. At the end of round 2, time back.
4 times sacrifice level 3 equals quite a lot of creatures you get for free...