Fourth Impact

Lore & Background

The visual manifestation of this event is a surreal transformation where solid matter liquefies into LCL, the primordial soup from which life originated. As individuals lose their AT Fields—the barriers that separate souls—physical bodies dissolve, and consciousness merges into a single, collective existence. This process represents an involuntary realization of Instrumentality, stripping away the pain of loneliness by removing the very concept of self. It marks the ultimate failure of NERV's containment protocols and the terrifying success of SEELE's desire to revert humanity to its origin.

Reader's Guide

The Fourth Impact marks the climax of humanity's struggle for existence against its own nature. While previous Impacts were external forces that reset civilization, this event is an internal collapse caused by the breach between the human soul and divine energy. It begins when Unit-01, acting under its own will or through specific activation, generates an S² Engine. This infinite power source bypasses all safety mechanisms of the Eva units, projecting a field that neutralizes AT Fields globally.

Without these barriers to define individual existence, biological matter cannot maintain its structure. The result is a planetary-scale liquefaction where oceans rise and continents vanish into a sea of LCL. Humanity does not die in the traditional sense but ceases to exist as separate entities. This state mirrors the goal of Instrumentality, yet it arrives without consent or preparation, highlighting the fragility of human identity.

Ultimately, the event serves as a crucible for the characters' final choices. It forces a confrontation with the desire to be alone versus the comfort of merging, leading to a resolution where individuality is either reclaimed or permanently surrendered.

Did You Know?

• The term 'Fourth Impact' originates from the Rebuild of Evangelion film series, a separate continuity; in the original series and End of Evangelion, Instrumentality is never called by that name.
• The event is not fully reversed in the anime conclusion; Shinji rejects Instrumentality and chooses to return, but only Shinji and Asuka are shown returning, leaving humanity's ultimate fate ambiguous.