The book is framed as research stolen from the Xanathar by a protégé of Volothamp Geddarm, presenting its new rules and lore in the unique, cynical style of the crime syndicate.
is a massive collaborative supplement for Dungeons & Dragons 5th Edition (D&D 5e), designed as a companion to the official Xanathar’s Guide to Everything . Published through the DMs Guild Adept program , this 87-page book offers a deep dive into character options, dungeon master tools, and lore that expand upon the core rulebooks. What is Xanathar’s Lost Notes to Everything Else?
The supplement is packed with content that touches nearly every aspect of D&D gameplay:
While it carries the "Xanathar" name, it is . It is a high-quality homebrew project created by top-tier DMs Guild authors to provide players and DMs with options that didn't quite make it into the official hardcover.
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