The story is simple. Waterdeep needs heroes. For decades, the city has pretty much ignored the vast deathtrap dungeon (built by a mad archmage, naturally) lurking below the surface because, while adventurers and heroes might go in, nothing bad ever comes out. The problem is that now things are coming out all of a sudden. Bad things. The city is under siege from below and it looks like the Drow are responsible. The question is: is the mad archmage working with them? Or have they found a way around him?​