Library metadata can be full of dragons if not carefully tended to. Letting the weeds grow can end in the rise of that most dangerous of Data Dragon, the dreaded Earwrym. During this presentation, Galen Charlton will demonstrate tools and techniques for identifying, measuring, and fixing problems with metadata in your Evergreen catalog. He will cover a wide range of data issues from incomplete records, bad fixed field values, and record duplication. Attendees will leave the session knowing about practical approaches that can be used right now to address data issues. Attendees will also be invited to start a conversation about the future of data maintenance in Evergreen.