It was intended to be a minor side effect, more than anything. The benefit is simply that they become a part of a larger whole, like a drone. That could use some polish, clearly.

The idea is that, where the other Ministries make 1 or 2 servitors, these guys convert warriors in the grinder steadily. Thus, they build up servants easily in wartime and immediately use them to control the flow of a war and gain potential tools later on.

Maybe: As the spells scour the souls of the warriors, they tend to lose sight of self. This makes them easier to convince to do things that...