Cheapest Method to do Black Magic

Obviously, any way of doing black magic, or for that matter even "white magic" will damage your soul.

In some cases, when those who make the distinction consider the task as black, it will probably be somewhat costly and painful as well.

Do Satanic warlocks, do Wiccan witches have an easier way to get such things done?

I think they do and have used it. It is making Catholic priests or "Catholic priests" do it for you.*

How so? Well, no, I don't mean priest totally that corrupt that they will take a bribe to pray for someone's damage.

I mean such people would try to convince the priest that the prayers would really be for someone's correction or benefit or keeping him out of harm or sth.

Why do I think this may have happened to me? Because things have been going wrong for quite a while, and if they are getting better, I'm bad at seeing it, and I don't think I gave that much of an opening to actual demons./HGL

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* In case the ordination is invalid, the parishioners are likely to include people who can pray because they think their priest is Catholic and validly ordained and should be obeyed.