I am fairly new to Descent and have ran a few games before using the app. I can't seem to find anything about there not being a overlord in the games. Am I running it wrong using the app as an assistant or can there be a overlord.
The app uses an additional rulebook that you can find here: https://images-cdn.fantasyflightgames.com/filer_public/7b/b8...
As the sidebar on page 4 says, "Road to Legend is a cooperative game with no overlord player. All players are on the hero side and win or lose the quests and campaign together."