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Theosyion, the Restorative Mind is the boss of the Echo Chamber strike.


Theosyion is one of the Restorative Minds, which have the power to undo the destruction of an Axis Mind.[1]It is evidenced by the appearance of the Restorative Mind that the destruction of the Nexus Mind had dealt a devastating blow to Vex operations on Venus.[1]

Theosyion has been summoned to Venus to create a bridge through time that will undo Sekrion's destruction.[2]


  1. 1.0 1.1 List of Grimoire Cards/Theosyion, the Restorative Mind
  2. List of Grimoire Cards/Echo Chamber