Leiah7
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Yeah... We know for sure that the little brother is being used. She should be an ally but her appearance and their meeting is a bit suspicious. We will hear her story. Maybe there is a mastermind to their meeting. Whether ally or not, we don't know now.
I prefer the mage-slayer. Her system also supports this more. It would also suck if she couldn't do magic or normal enchantments anymore. But maybe she can learn some death-knight runes and some other tricks? It's your story. Just make things logical and natural.