It won't be too much longer before the first of Sea of Thieves' two free summer add-ons makes an appearance. Rare and Microsoft have revealed that Cursed Sails will be available to Windows and Xbox One players on July 31st. The DLC introduces "terrifying" ships with skeletal crews, a three-person Brigantine ship and Alliances that help you take on larger challenges in return for similarly huge rewards. You'll want to act quickly if you want to make the most of Cursed Sails, though -- the campaign associated with the DLC lasts just three weeks.