Straight Outta The Abyss
Trapped in the Underdark!
You adventurers ended up in the worst place at the worst time. After escaping the drow prison of Velkynvelve you discovered that something horrible is lurking in the shadowy caverns of the Underdark.
With no obvious escape route, the drow on your tail, and that thing running loose, the best you can hope to do is survive.