Witness had memory of it and it would've been sick to see it manifested as a zone in the Pale Heart. Massive missed opportunity. Even just a flashback vision upon touching a Dissenter Statue would've sufficed.
I wanted to see the Pyramids arrive and the bleakness and despair Humanity felt as darkness beasts under Nezarecs control ran wild across the Earth's surface as Witness gave some sort of salvation has arrived speech.
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I imagine the collapse was essentially what happens in the one cut scene with the mother and child where they essentially get frozen and then swallowed up by the smoke