Inside the ruins, after thoroughly reading Zero's report, Anvis manipulated the Metallic Rubik's Cube with divided attention while pondering how to react next.
Now, he had also vaguely realized the purpose of Zero's special visit to inform him—it was probably to make the Four Great Families more vigilant, thus further provoking the Marquises.
According to the information revealed in Zero's report, when Claire or some other lucky individual triggers the hidden conditions of the ruins, exposing the true secret of the half ruin, it's feared that the Empire's Ninth Rank powerhouses will start to fall into disarray first.
However, Anvis believed that the Duke and others would not be unprepared for external enemies. The current situation is just as if they have an extra half-enemy.
The reason it's called a half-enemy is that the attitude of the Marquises is also outward when facing foreign foes.