Past the last two rooms, the grand hall splits left and right.
There is a grand statue of the Vampire Queen. Inspection will reveal that the statue is made of newer material than the surrounding walls.
Going down either hallway, there is a 1 in 6 chance that characters will notice the slope of the flow is taking them down. The slope is not enough to send the characters down a full level, but enough to concern them.
Notes: Things should start picking up.
I have seen lots of great maps online for others, and I thought maybe I could share mine. ;)