Keep losing to her. You will eventually meet Llavanya. She will give you armor and spells, but it won't be enough - keep losing to her. After Llavanya forges a weapon* for you, you'll be able to defeat Mary in battle (it will be somewhat easy, as she will take normal damage instead of 0 after using a potion).Tell me how to kill Mary in the phase when she restores 10k health to herself.
* (notice that you actually don't need to use that weapon nor her skills to defeat Mary; so, if you are an archer, keep using your bow, as Llavanya don't give you the option to forge a bow/crossbow and your damage will be better with a weapon of your class)
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