The magic I use sometimes is the same, like someone could make a wish, like saving their parents from dying and I could grant it but there will always be a big but to it. It could be that the parents were saved but the person who made the wish died, or that they died later on, or simply that the parents were saved in a parallel world while the person who made the wish is still without them. Sometimes I can take the penalty for myself and avoid such grim outcomes, but for the most part I prefer to avoid granting wishes which I'm not sure can be fulfilled without "but"s added to them.

[This should also explain why he seems to refuse to help people, the most direct way to do so could end bringing them pain anyway. It's not worth it.

Primo hums for a second before he dares another question.]

Mami-chan, do you know what would happen should your soul gem lose its shine?