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Of course, the easy way out would be to purify it with holy magic. But this undead seemed high ranked, my holy light magic was very weak in comparison as I lacked affinity for it, so it was of the lowest possible level. Elizabeth could help in that regard if it wasn't because she's extremely tired, if I overexert her more for now, she might end up shattering her soul. When magicians overuse a certain element above their own limits without precautions, their soul might take a burden and take direct damage. Her spirit also helped, but it seems tired after using that magic that killed the Hydra.
At the very least, Elizabeth needs to rest for ten minutes if she doesn't want to shatter her soul. I cannot let her die now, or Ellergest and the priests would kill me when I get there. And it is not really my style to make other sacrifice themselves for me anymore, even less when it is just against a mere undead that is just a bit stronger than the others.
Check "The Protagnist's Sister Is Actually the Strongest"!