Description
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The Power Filter is a device made to filter toxins out of the Rusalki's Power Supply. Elsenova tells Trace that reactivating the Power Filter is necessary to help drain her of a "poison" that keeps her in a weakened state.

Composite image of the Power Filter
Location
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The Power Filter can be activated after defeating the Uruku Variant, between the boss room and the room with the White Lab Coat.