This level occupies the map slot MAP20. For other maps which occupy this slot, see Category:MAP20.
MAP20: The Forsaken Hall is the twentieth map of Requiem. It was designed by Adam Windsor, and uses the music track "Take All (I have more)" by Mark Klem. It is the second smallest level in the megawad, unusually small in comparison to most of the other levels.
According to both the text file and the Requiem info pack:
This seems to be a quiet, forgotten corner of Hell. You suspect it won't stay forgotten for long.
At the start of the level, there is an arrow made of health bonuses in the southwest, pointing at the west side of the southern wall. Open it to find some shells, two rockets, and a backpack. (sector 18)
On the walkways around where the yellow keycard sits, two walls at the west side of either walkway, near the keycard, are bordered by rsuted metal. Push on them, and they will instantly lower, allowing you to jump down, and obtain a medikit and a box of shells. (sector 105) Use any one of the teleporters to exit.