While Vandalieu was creating mayonnaise, the boulders sealing off the tunnel leading to the Mirg shield-nation were destroyed, and adventurers and Vampires emerged from within. Judging from the contents of their conversation:

The Vampires who worship Hihiryushukaka, the Evil God of Joyful Life, were utilizing the Empire and Mirg shield-nation in order to repeat the Talosheim invasion of two hundred years ago.
They had used Magic Items to determine Eleanora’s location and concluded that Vandalieu was in Talosheim.
However, it seemed that they currently had no plans to conduct reconnaissance in Talosheim. Vandalieu and the Ghouls had previously escaped from the Devil’s Nest forest without fighting, so they were wary that the same thing would happen again. They were also wary of the risk that that if casualties were suffered during reconnaissance, Vandalieu would gain information from their spirits.
Eleanora looked mortified. “I do recall them taking my blood on numerous occasions, but I didn’t realize that such Magic Items existed…”

“Well, don’t worry about it,” said Vandalieu. “It’s convenient because they’re coming straight here. So now the four members of the adventurer party and one of the Vampires is guarding the tunnel’s exit. The other two Vampires have returned to their community to let them know. It seems the Mirg shield-nation has been contacted through Magic Items.”

As to be expected of a community of Vampires with Pure-breeds who had lived for hundreds of thousands of years standing at the top. It seemed that they possessed all kinds of Magic Items that Eleanora had no knowledge about. With that said, those Magic Items were tools to locate traitors, quite fitting of them considering the teachings of the Evil God of Joyful Life and Birkyne’s personality.

Did they find Valen’s… Father’s location with this item as well? Well, leaving that aside…

“So when do you think they will arrive?” asked Zadiris.

“It seems they haven’t come to a concrete decision yet.”

Judging from the adventurers’ conversation… adventurers and knights would come through the tunnel to confirm its safety and protect the exit. The adventurers would then return. At the same time, a war council led by the Amid Empire would take place to discuss the tunnel’s discovery and the upcoming invasion.