From the back cover: Generations ago, the most dangerous artifact in the world was lost beneath the streets of Baldur's Gate. Now it's your job to go and find it... Shield of the Hidden Lord is an 8-10 hour Dungeons & Dragons adventure for characters of 1st to 4th level. It expands upon the material presented in Baldur's Gate: Descent into Avernus, but can be played on its own or as part of any D&D campaign.