Nightmare System

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The Nightmare System is a reoccurring concept in Megami Tensei franchise. It is a system that harvests magatsuhi across a wide area.

Game Appearances

Shin Megami Tensei III: Nocturne

The The Nightmare System is introduced in Shin Megami Tensei III: Nocturne. In order to gather the magatsuhi required to summon the god to sponsor the Reason of Shijima, Hikawa unleashes the Nightmare System on Ikebukuro to simultaneously collect a large sum of magatsuhi and destroy the Mantra army and Gozu-Tennoh. This results in the death of most members of the Mantra leaving their forces in complete disarray, and Gozu-Tennoh is left shattered and near death until Chiaki Tachibana arrives to absorb his power and rally the remaining Mantra behind her.

Shin Megami Tensei V

In order to reclaim the power lost when the Condemnation reduced her from a goddess to a demon, Ishtar implemented the Nightmare System around Chiyoda to siphon magatsuhi into her, empowering her to greatly increase her power to the point so is near the power she wielded as a Nahobino. The Nahobino is able to shut down the Nightmare System around Chiyoda, depriving her of her increased power and allowing him to battle her in a weakened state, or he can face Ishtar at her full power.

Shin Megami Tensei V: Vengeance

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In order to harvest magatsuhi for the summoning of the mother goddess, Agrat created a Nightmare System at Jozoji to drain magatsuhi from humans in the surrounding Tokyo, using the guise of Agra the fortune teller to single out humans that would provide the most magatsuhi, resulting in people across Tokyo being drained of energy to the point that Hayao Koshimizu ordered a full city lock down to prevent further spread. As a countermeasure, Mastema patrolled Tokyo and turned any human that had been selected by Agrat and transformed them into salt, ensuring that their magatsuhi could not be harvested.

Nomenclature

Names in Other Languages

Language	Name	Meaning
Japanese	ナイトメア・システム Naitomea shisutemu	Nightmare System