Wart's Nightmare is the fifth secret level in World 9: Edge of Beyond, and is the third and final act of the Subcon Panic sub-quest. Wart's Nightmare illustrates how Wart's allegiance to Legion did not go quite as planned. While most of Wart's subcon strongholds were fused safely into the physical world, his own palace was not quite as lucky, finding itself stranded in a Flood-infested region of the Halo universe. The flood quickly overwhelmed the palace, transforming the normal Subcon enemies into vicious flood-infested monstrosities, and forcing Wart to seal himself inside his chambers to escape the horrors lurking outside.