Wizards of the Coast has unveiled their contribution to this year's Free RPG Day.
According to the Free RPG Day Facebook page, Domain of Dread: Histhaven would be a supplement for the Shadowfell: Gloomwrought and Beyond boxed set that will be released on May 15.
There is no other information and details of what is contained inside the book, except that it is written by Erik Scott de Bie, but map tiles are likely not to be included with this supplement.
Speaking of the Shadowfell boxed set, Critical Hits has done an unboxing post to show you the contents inside the box.
(Picture credit to Facebook)