This level occupies the map slot MAP30. For other maps which occupy this slot, see Category:MAP30.
MAP30: Nevermore is the thirtieth and final map of Requiem. It was designed by Adam Windsor, and uses the music track "Under Death" by Mark Klem.
According to both the text file and the Requiem info pack:
You have uncovered the secret stronghold of the Demons .... Intelligence says you should have the advantage of surprise on your side, but they believe that the Demons will be able to summon many reinforcements quickly, if need be. Your objective is straightforward enough -- find the switch to open the shielding on the Demons' power core and destroy the power source itself, but you must do so quickly enough that demonic reinforcements do not overwhelm you ....