Middle Chamber
Unless the players somehow manage to sneak past the ghouls in the Chamber of Obrum, and then alert them while here, this chamber is empty of threats. There are only two sarcophagi here, set into well-carved alcoves, plus a third set in the corridor leading form the Chamber of Obrum - as with the others, these are emptied, with piles of bones from the devoured corpses mixed with sulphur dust spilled out across the floor.
If the ghouls throughout the crypts are aware of the player characters, their intention will be to let them continue into either the Lower Chamber or the Upper Chamber, moving freely between those chambers and the Last Chamber, so that they can be attacked en masse, with half the total force of ghouls charging from the Last Chamber and half charging from the this chamber, in order to overwhelm them in whatever chamber they choose next…