D&D 5E: Baldur’s Gate - Descent into Avernus

Evil armies! Fiery torment! Contract law!
The city Elturel has vanished, stolen by the archdevil Zariel as fodder for the eternal Blood War

The party must enter the fray to save Elturel and her people from the devil's army and bring them home.

New-player-friendly table, in the blue room