Baldur's Gate: Descent into Avernus

Fort Knucklebone provides shelter to a gang of wasteland marauders called the Knucklebones, serving as a garage where they build and repair infernal war machines. The Knucklebones answer to Mad Maggie, a night hag warlord who has an agreement with Zariel: the archduke of Avernus leaves Fort Knucklebone alone as long as Mad Maggie keeps the other warlords in the area in check.