Lucifer Palace (ナラク) is a dungeon found in Shin Megami Tensei IV. It serves as one of the two final dungeons.
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A special domain set up by Lucifer near the end of the game within Camp Ichigaya. It blocks access to the Yamato Perpetual Reactor. The palace is divided into several areas. The Hall of Eternity consists of a grand hall with doors that teleport to each other. The demons Belial and Lucifuge have hidden themselves within this corridor, and must be defeated to open a portal to the Hall of Eternal Light. This area appears outdoors under a swirling sky, and must be navigated through a series of door teleporters to reach the Morning Star Hall.
In the Neutral route, in order to fully revive Masakado and remove the Firmament, Flynn must enter here and defeat Lucifer to recover the Great Spirit of Spite. Making his way through the corridors, he eventually reaches Morning Star Hall where he encounters Walter. He asks Flynn not to kill the Demon Lord, as Lucifer is the desire of all humans. Though he wishes not to see Flynn perish, he realizes his former comrade is determined to see it through, and wished he could avoid having to use his power on him. Walter then transforms into the visage of the Lucifer, who asks of the light of hope will still shine even before him.