This is an expansion and requires the base game to play: Yes

The heroes of Terrinoth take on many shapes and sizes. From stoic warriors leading the charge of battle to powerful mages harnessing the power of rune shards to conjure powerful magics to defeat their foes. Your adventures in Descent: Journeys in the Dark Second Edition have seen you step into the shoes of countless heroes, and now your options are even greater.

Now discover ancient knowledge lost for centuries with the Lost Legends expansion for Descent: Journeys in the Dark!

Lost Legends includes new class options for players venturing into the dark, including two new standard classes and eight new hybrid classes. This expansion opens up hundreds of new hero and class combinations for you to discover as you continue your adventures in Terrinoth!