Yamato Perpetual Reactor

Yamato Perpetual Reactor is a device found in Shin Megami Tensei IV.

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A machine which the Ashura-kai use to power Tokyo with electricity. Yuriko and the Ring of Gaea are attempting to acquire it for themselves, leading to Tayama sending the Samurai on a mission to kill her to stop it. It also holds the power to open portals to alternate worlds and even the Expanse, the realm from which demons originate.