Magical bones
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[Private Zelroth enters the library, carrying himself with a sense of pride despite the gruesome appearance of his burnt face. He asks the librarian to aid him in researching any topics relevant to specific dangerous monsters that have magical bones by nature and if those bones have been used to create items of significant power]
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Numerous magical animals leave magical remains, often related to their nature. White Stag Antlers, for example, can be ground into a powder and be used to purify various non-magical poisons.