Keiri

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Keiri is the school's head nurse. She takes care of many of the patients and instructs her multiple apprentices in the same thing. She was also a friend of Wraith's, and may know more about him than anyone else at the school. She seems to enjoy transforming her patients into interesting things, so getting healed by her is a risky venture. It might just be an incentive to keep out of her office, though.