Miss Peregrine's Home for Peculiar Children
What is an ymbryne? What is the most important job of an ymbryne
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From the text:
Miss Peregrine nodded soberly. “Most, however, slip back and forth only occasionally, by accident. We who can manipulate time fields consciously — and not only for ourselves, but for others — are known as ymbrynes. We create temporal loops in which peculiar folk can live indefinitely.”
Miss Peregrine's Home for Peculiar Children