After the origins of the Elves had been altered, the legend still remained, and in that Memory City, the Eternal Messenger sat on the eternal Golden Throne and heard a multitude of pained screams emanating from inside the toilet.
The timeline had converged, and now, no matter how the Primeval Elves calculated, they could only foresee a future where they were incinerated by the toilet.
".....This is no different from working in the giant tower, Shay sits in the living room suppressing the Abyss, and I'm in the bathroom suppressing the Primeval Elves, is this punishment for my skipping work?"
Due to the altered origin, the Eternal Messenger no longer had any connection with the Primeval Elves, so he could see their history edited by the God of Light and Shadow from within Memory City. Of course, that Deity would not let him off so easily.
Since the origins had been altered, the God of Light and Shadow could now come here, and even this "city" was no longer just a place in memory.