This level occupies the map slot MAP26. For other maps which occupy this slot, see Category:MAP26.
MAP26: Excoriation is the twenty-sixth map of Requiem. It was designed by Adam Windsor, and uses the music track "The Rhythm of Carnage" by David Shaw. It is the smallest and shortest level in the megawad.
According to both the text file and the Requiem info pack:
A nightmare of frantic combat. You remember violent flashes of naked fear ... the red-hot barrels of your shotgun burning your hands ... you remember laughing in the carnage.