Baldur’s Gate: Decent into Avernus is one of the latest Dungeons & Dragons prewritten campaign setting books by Wizards of the Coast released September 17th 2019. Baldur’s Gate is a city that sits on the sword coast that is loaded with corruption and packed with people. There is not a whole lot of time that will be spent in the city though as the players descend into the first realm of the 9 hells named Avernus.