Ment
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The thing is, Nimue's specialization is gating, i.e., overwhelming with brute force. It's the most combat-oriented specialization of all.
Gating is magic, if you think about it. And it's no longer just for brute force, in my opinion (you need to level it up a lot to be effective in that way), but for tactical possibilities. Blocking enemy archers, preventing your main force from being exposed, removing debuffs... I think this setup is suitable for a hero with a focus on magic.