She sniggers. "You're right, that would be useful. Until you met your first magic user. Even if you hardened it against magic, you'd still be vulnerable to being roasted alive in it, or having a pit opened up beneath you that you couldn't climb out of, or water. That, and, for the design? Crafting it out of adamantium might be cheaper," she says with a laugh. "That, at least, will inherently protect you against elemental attacks."