"Lost Dungeon."
Varian's eyes lost focus and his shoulders dropped.
Dungeons appeared in the solar system in 300 YAB. They were only low Dungeons.
Humanity found ways to keep the magic beasts in the Dungeon from breaking out and raided them instead.
However, there was one thing about Dungeons humans never mastered.
Vanishing of Dungeons.
The first vanish happened many years after 300 YAB. It was treated as a hoax. Many questioned whether it was the job of a supernatural entity or the return of the Shadow Nation.
Despite the eeriness, humans still flocked to the dungeons.
A few more dungeons vanished. If it was public, then the economy that was just boosted by the dungeons would collapse.
So the government, as always, was quick to suppress the news.
The incidents were few and far between, so the issue was swept under the rug.
It worked until a similar incident happened in 422.