Dangerous Dungeons Preview: Empty Dungeon Rooms

Empty Rooms
Room shows evidence of some brutal combat having taken place in the recent past. Walls are covered in bloodstains and bits of gore. Bones or rotting bits of flesh cover the floor.
Areas of the walls and floor are faded or stained, as if the room once contained several pieces of furniture or other furnishings, now missing.
The room appears as if it has been refurbished. The walls are spotless and the floor is unmarked as if recently retiled. Otherwise, there are no furnishings.
The walls here are splotched and covered in mold as if the room had once been flooded. Rotten bits of wood and textile can be found on the floor.
Whatever it’s original purpose, this room has been used as a toilet by whomever lives nearby. The stench is almost unbearable and the corners are piled high with feces.
The walls and floor of this room are covered in names from every conceivable race and culture scrawled in black charcoal. On the ceiling, in big red letters is the caption ‘ People Zaxes Doesn’t Like’. Who or what Zaxes is or who the other names belong to is a mystery.
Some great conflagration has engulfed this room. Both the walls and floor are scorched and black and in places appear melted by some great heat.
A large square is drawn in the middle of the floor in chalk and in it is written the word ‘IN’. On the floor near the door through which the PCs enter is written the word ‘OUT’.
The room is completely empty but is permeated by a sickly sweet odor as if someone has recently been smoking pipeweed. If re-entered at a later date, the room will still smell as if someone has only recently been smoking here, but will still be completely empty.
The walls of this room are covered in frescoes depicting ordinary life in a dungeon, if such could ever be called ‘ordinary’. Certain figures have been deliberately scraped away by some unknown hand.
In one corner of the room is a fake trapdoor. If opened, it reveals only featureless bedrock.
Cobwebs fill the room from top to bottom. If burned or brushed away, a task that takes 1d3 turns, nothing whatsoever, including a spider, is found in the room.
The entire room radiates a palpable evil dweomer although it is completely empty of both occupants or objects.
Although empty, a trail of ants leads from a crack in one corner of the room, across the floor and up the wall into another small crack in the ceiling.
A distinctly funky smell pervades the room, and traces of bodily fluids can be seen splattered hither and yon. Crude sexual sketched are scrawled on the walls including an inscription in Common that reads ‘For a good time, call Big Steev’. In one wall, at waist level, is a small hole that proves to be only 3 inches deep if probed. 
The room is bathed in a pale white light with no obvious source. A distant humming can be heard. If 1d2 turns are spent searching the room, the PCs find an inscription in one corner, in very tiny Common the phrase “There is no reason and the truth is plain to see.”
The layer of dust and rat droppings that blankets the room appears to have been recently disturbed by someone or something who apparently removed what could have been a large treasure chest once sitting in the corner. Marked on the dust in the floor nearby are the words ‘Jaymal was here’.
The room is very cold and dust-covered. Small footprints lead from the door to the center of the room where there is a kobold-sized snow angel.
This room is enshrouded by permanent magical darkness but is nevertheless, completely empty.
This room is completely unremarkable and empty.