So here is the setup: They were investigating the dungeons beneath an active slaughterhouse. This slaughter house was formerly the site of a prison which, in turn, was really a converted asylum. The dungeons are inhabited by a Blood Cult. Rather than clearing rooms as they went, the PCs proceeded right into the belly of the beast. They have retreated to a previous room where they have spiked the doors shut and are hoping to take a long rest. By not clearing rooms they have allowed their escape route to be cutoff.
Here is the breakdown of what they have fought so far this day. This is a party of 5 4th level PCs (bard, barbarian, druid, cleric, wizard). The bard and barbarian are at 3/4 HP everyone else is at full. The bard, wizard and cleric are almost down to cantrips, the druid has most spells left:
(1) gibbering mouther
(4) human guards
(2) human thugs, (8) mastiffs and (1) devil dog. It was after this fight that the retreated to their "safe room". The whole complex knows that they are there, not necessarily the exact location. I plan on allowing them to begin a long rest but then be awakened after an hour by voices and pounding noises. They will receive the benefit of a short rest. The safe room has four doors and there will be adversaries behind each one:
Door 1. 9 human acolytes
Door 2. 9 human cultists
Door 3. 1 human veteran, 1 human cult fanatic, 2 human guards
Door 4. 6 insane torture victims (half-strength berserkers with no armor of weapons other than their fists)
Obviously I had not intended this result, but the party was careless w/ regard to kicking in doors and using shatter/thunderwave spells to announce their presence. It's not a foregone conclusion that they will die but I want an interesting contingency vs. 'roll up new characters'. One is a 'capture and escape' scenario, the other would be the 'return as ghosts'. I haven't reviewed the "Fires of Hell" yet.