Publisher Blurb: A Free Adventure for 1st-Level Arcana Unearthed Characters. The Thrice-Cursed Crown by Mike Mearls is an introductory adventure for Monte Cook’s Arcana Unearthed. If you’ve been looking for a good way to introduce your friends to Arcana Unearthed, running this 14-page free adventure is a great way to do it. It also makes a fun one-shot as a break from your normal game or a good starting point if you’re looking to launch a new campaign in the Lands of the Diamond Throne.