A lingual decryptor is a written or spoken work, artifact, or other record that is multilingual and can serve as a means of translating other languages within the same work. It is most associated with antiquated languages that have fallen out of use or that are not mutually intelligible with modern descendants of that language, but decryption is sometimes also necessary for scientific terms, slang, or other now-unused words from centuries past, especially during the earlier years of the Millennial Calm and earlier periods.
At times, a spell can serve as a starting point for decrypting a language, but such efforts are time-consuming and require enormous controlled trial-and-error casts of words in isolation and in context to start to unravel more than basic semantic meaning.