Dungeons & Dragons Baldur's Gate: Descent Into Avernus Hardcover Book (D&D; Adventure) : Hardback : Wizards of the Coast : 9780786966769 : 0786966769 : 17 Sep 2019 : This heroic adventure book takes players from levels 1 to 13 as they journey through Baldur's Gate and into Avernus, the first layer of the Nine Hells. The text introduces the infernal war machines to fifth edition D&D--battle-ready; vehicles.cles.