Epics are larger Stories. In the Storymap Tree you can have as many levels of Epics as you like to describe the project. Once you reach a level that cannot be broken down into smaller parts, you create Stories. 

Epics can be planned to Releases but, not to Sprints or Kanban lanes – only Stories can be tactically planned. 

The state of the Epic will change according to the state of the Stories/Epics below it. When any of the children are In Progress, then so is the Epic. The Epic can only be set to Done when all children are Done.

Epics are visible in the StoryMap Tree in the “What” section. They can either be part of a larger epic or categorized in folders. The hierarchical structure of epics can be viewed in the Storymap Tree.