It varies by season. In chapter 4, the last encounter in each season is the entrance to the vault.So, I’ll admit to a bit of skimming (not finding this the most readable adventure, given the four parallel plots, I probably need to pick a villain and read it that way), but I did not see a location given for the vault?
Did I miss it? If I didn’t, where would be a good place for large, forgotten?, Dwarven vault?
Some of them are silly, but the part I like is that if the players have been interacting with the environment and the NPCs they'll know how to find the keys.And did anyone else eye-roll on the key options? I’d prefer some thing that needs to be assembled into a contraption/key that opens the door (and has some connection to Neverember...)
Still, I hear you. I like the idea of hiding the keys in the various lairs. If you buy Unseen Waterdeep it will give you another option for that, too.