Then if you rush through the level with the Invulnerabilities and avoid killing the Cyberdemons, upon her being set free you can simply hide in one of the elevated side rooms where her and the Cyberdemons can't reach nor hit you, and then just wait for the Cyberdemons to kill her in the inevitable infighting that occurs from them trying to hit you. Even if she were to teleport in the main battling area and you decide to fight her without the Unmaker nor BFG rushing her, there are so many side walls and cover that can block her homing missiles before it directs against you, making avoiding her attacks simple unlike in the much more open Absolution. If she decides to fight you before entering the portal, none of her 2 attacks can hit you because the pillars are blocking her attacks. Once you open the door, you can immediately fire at her effortlessly before she enters the portal because of the small pillar gap where your Unmaker's shots are small enough to go through. There are also 3 Invulnerability Spheres in the level you can use one or two of them to clear most of the area out (in case you fear the Cyberdemon) or speed run it, and then save one at the end for a free win against her. The Unmaker is immediately available in the beginning, and you need to collect the 3 required Demon Keys in the level to open her door, which also powers up the Unmaker at maximum power. She is essentially just a rematch with the Mother Demon, but due to the level's layout, it puts her at a major disadvantage.

Anti-Climax Boss: The Sister Resurrector, who wants revenge against you in The Lost Levels after you have killed the Mother Demon.

Doom 1 secret levels