Fourth Impact

Fourth Impact (フォースインパクト) is a cataclysmic event that occurs in the movie Evangelion 3.0: You Can (Not) Redo, and is fully completed in Evangelion: 3.0+1.0 Thrice Upon A Time The Fourth Impact is a prerequisite for SEELE's scenario for Human Instrumentality.

Evangelion: 3.0 You Can (Not) Redo
The Fourth Impact begins as the continuation of the Third Impact, not fully realized in the 14 year gap. Evangelion 13 removes the two Spears of Longinus from the body of Lilith which is currently fused to Mark.06. After the removal, Lilith's corpse is destroyed, exploding into a red liquid.

After the destruction of Lilith, Mark.09 decapitates the previously dormant Mark.06 causing it to reactivate freeing the previously contained Twelfth Angel in the process. After Unit-02'γ fails to kill the angel, Evangelion 13 absorbs the Twelfth Angel, and the Fourth Impact begins. Now awakened, Evangelion 13 turns brilliant white, gains two halos and massive spikes grow from its now destroyed shoulder pylons and the impact begins. The Gates of Guf open above pulling The Black Moon from the ground. The Golgotha Object can be seen in the center of the Gates of Guf, seemingly returning to Earth to allow Human Instrumentality to be realized.

In an attempt to stop the impact, Kaworu takes control of Evangelion 13, plunging the Spears of Longinus into it before allowing the DSS Choker to kill him. Despite his death, the impact is still ongoing as Shinji still remains an active trigger. Mari attempts to remove Shinji's entry plug as the power of Evangelion 13 decreases and it falls from the sky. Kaworu's image appears briefly as Shinji's entry plug is removed, leaving it ambiguous as to who exactly ended the impact. With both pilots removed, Evangelion 13 loses all power and shuts down.

Evangelion: 3.0+1.0 Thrice Upon A Time
Disabled by the spears of Longinus, Nerv HQ begins the process of reawakening Evangelion 13 and resuming the Fourth Impact by transporting the Adams (the NHS ships), the Black Moon, and Evangelion 13 to the site of the Second Impact. After a long battle with WILLE, the NHS Seires awaken, converting the Black Moon into spears. These new spears are plunged into the epicenter of the Second Impact, reopening the Gates of Guf and the Fourth Impact resumes.

Following this, every human soul which was returned to the Guf in Third Impact is released and merged with the Failures of Infinity, preparing them for Human Instrumentality. Evangelion 13 reawakens after defeating the Asuka-New Unit-02α hybrid and absorbing Asuka after she becomes an Angel. Gendo Ikari allows himself to be absorbed by Evangelion 13, becoming its soul. Gendo takes a corrized Unit-01 and the two Spears of Longinus into the Minus Space, completing the prerequisites for Gendo's Additional Impact.

Trivia

 * It is possible the presence of two halos is symbolizing the two impact triggers, Kaworu Nagisa and Shinji Ikari.

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