“Avernus will send new and returning players on a new journey where they’ll be able to drive infernal war machines, unravel the mysterious past of the Archdevil Zariel and witness how their actions directly impact and evolve the world. The update will also bring epic story content that concludes the previous update’s storyline based on the Dungeons & Dragons tabletop adventure, Baldur’s Gate: Descent Into Avernus. […] In Avernus, players will continue their adventure through the first layer of the nine hells and unravel the mysterious past of the Archdevil Zariel with the help of Lulu the holyphant. This module brings with it a new Adventure Zone, a new end-game Trial, class balancing, and more. Be prepared to drive an infernal war machine and face new foes as you conclude this fiendish storyline!”
Everything we know so far about the module: