Iver had no idea exactly when Isabel and Yulia would be heading to Antimony.
But Iver had contacted Isabel beforehand—when Yulia went to Antimony, Isabel would bring the Queen Guard with her.
This was to suppress the Children of the Moon who now "ruled" Antimony.
Although the Red Minister was dead, the remnants of the Red Fort and those Demon Scholars of the "Rosy Cross" Society might not have abandoned the idea of using Yulia's blood to open the Herasul Secret Treasure. Isabel bringing the Queen Guard along was mainly to make them give up on that dangerous notion... and if anyone still refused to give up and planned to force the issue, it would give Avalon and the Theocracy a perfect excuse to intervene in Antimony's situation.
...However, this plan had been prepared under the assumption that no Fallen Angel would descend.
Now, for some reason, the "Rosy Cross" Society had suddenly gone mad and opened the Ouroboros Ring Ritual ahead of time, causing the Fallen Angel to descend...
The Fallen Angel was completely unafraid of those Fifth Level Pope Guards—who were now the Queen Guard. To the Fallen Angel, no number of mass-produced Fifth Level beings without special priority blessings would be of any use.
That was a descended Angel! Even with its level suppressed to the Sixth Level, it absolutely could not be dealt with through "numbers" alone.
Moreover... the side with the advantage in "numbers" could not possibly be them.
That vast Demon Legion was the army the Fallen Angel had brought after descending.
In another world line, when the Shadow Angel descended upon Avalon, it would transform the entire Avalon into the Shadow Land. Within this "cursed" territory, all rules would gradually overlap with those of the Shadow Land.
It was equivalent to these Angels