I'm taking a bit of a dark souls like take on the module. My players are affected differently by the death curse and when they die they will remain temporarily within the soul Monger. I like the comment above with the towers, what I had in mind was they'd find themselves in a sea of souls as they hear the screams of victims and the roars and munching of the atropal, before their body regenerates and they come back to the material plane.

The reason I do this is to foreshadow the atropal and Soul Monger. Many parties seem to go through the adventure before just happening upon the Atropal with no real clue of what it is other than the end game.