Because the Jailer is now better at it than him, and the Primus doesn’t know how to counteract it, I’d have thought. The mage trainer in Goldshire might be a mage. That doesn’t mean he understands how to counter Jaina’s high level magic. And that works totally without assuming that the kind of magic that Jaina uses is different from the arcane magic he uses. But since you are replying with a question I can assume that that was another theory of yours instead of something established? Ok then, I see no reason to buy into that one, yet.
But if you didn’t mean that there are different kinds of domination magic itself, and just that there are different techniques to use them with, like there would be in my mage-example, I can agree, but it doesn’t help very much.
Well, yes. If you want to analyze the magic, having something to analyze might be helpful.
They’re not supposed to enslave the dead, either. You have to invent a very special kind of moral code - which the lore untin now certainly hasn’t - to explain why the Primus would have a problem with one, but not with the other. I guess it’s not impossible, especially considering personal moral codes can include contradictions, but it is reaching quite a bit.
But let’s take it for granted at the moment. Doesn’t that run into a problem with your other point? If domination magic in itself isn’t specific to death, but the Primus made the helmet specifically to only affect the (un)dead… don’t we have to assume that he actually has a high degree of understanding of the magic, since he can deliberately exclude elements, without hampering functionality? Wouldn’t that require more understanding than just dabbling in it, not less?
Sure, I just wanted to be clear if we were talking about how it worked in lore, or if we could think of any possible explanation of how it might work under certain premises. If we’re talking about the later, we are already in agreement that there is the need for additional explanation, which is already most of my point. And the more we have to assume to get to an explanation that works, the more of an actual plot hole a lack of an official explanation would be by the end of this story.