giles aka fin said: can I please get a list of books that add to the Compendium so I dont waste my money. You can always request a refund, but the Marketplace descriptions include this information. If there is Compendium support, the Compendium is mentioned on the Marketplace page for the product. If there is no mention of the Compendium, it is 99% likely there is no Compendium support (yet). For example, look at the Marketplace page for the Sword Coast Adventurer's Guide ( <a href="https://marketplace.roll20.net/browse/bundle/8663/sword-coast-adventurers-guide" rel="nofollow">https://marketplace.roll20.net/browse/bundle/8663/sword-coast-adventurers-guide</a> ), scroll down to the section named Accessing Your Content , and you will see there is Compendium support. If you look at the Marketplace page for Princes of the Apocalypse ( <a href="https://marketplace.roll20.net/browse/module/96/princes-of-the-apocalypse" rel="nofollow">https://marketplace.roll20.net/browse/module/96/princes-of-the-apocalypse</a> ) there is no mention of the Compendium on the page. You can also post a question here in the forums about what is contained/supported in products before you buy. Someone with the product might even offer to launch a game with the product for you to join and take a look at.